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O-Rings

91 Reviews 3 Answered Questions

From $0.42 to $12.50

PN	MS Equivalent	Width	ID	OD	Price	Buy
MS28774-116	MS28774-116	3/32	3/4	15/16	$0.98	Quantity
AN6227B-1	MS28775-006	1/16	1/8	1/4	$0.61	Quantity
AN6227B-2	MS28775-007	1/16	5/32	9/32	$0.56	Quantity
AN6227B-3	MS28775-008	1/16	3/16	5/16	$0.89	Quantity
AN6227B-4	MS28775-009	1/16	7/32	11/32	$0.42	Quantity
AN6227B-5	MS28775-010	1/16	1/4	3/8	$0.83	Quantity
AN6227B-6	MS28775-011	1/16	5/16	7/16	$0.97	Quantity
AN6227B-7	MS28775-012	1/16	3/8	1/2	$0.78	Quantity
05-04892	MS28775-013	1/16	7/16	9/16	$0.62	Quantity
05-04893	MS28775-014	1/16	1/2	5/8	$1.10	Quantity
05-04646	MS28775-015	1/16	9/16	11/16	$0.81	Quantity
05-04894	MS28775-016	1/16	5/8	3/4	$1.05	Quantity
05-04895	MS28775-017	1/16	11/16	13/16	$0.77	Quantity
05-04896	MS28775-018	1/16	3/4	7/8	$0.62	Quantity
05-04897	MS28775-019	1/16	13/16	15/16	$0.84	Quantity
05-04898	MS28775-020	1/16	7/8	1	$0.78	Quantity
05-04899	MS28775-021	1/16	11/16	1-1/16	$0.53	Quantity
MS28775-022	MS28775-022	1/16	1	1-1/8	$0.95	Quantity
05-04901	MS28775-023	1/16	1-1/16	1-3/16	$1.01	Quantity
05-04902	MS28775-024	1/16	1-1/8	1-1/4	$1.10	Quantity
05-04903	MS28775-025	1/16	1-3/16	1-5/16	$1.19	Quantity
05-04911	MS28775-026	1/16	1-1/4	1-3/8	$0.99	Quantity
05-04912	MS28775-027	1/16	1-5/16	1-7/16	$0.93	Quantity
05-04913	MS28775-028	1/16	1-3/8	1-1/2	$1.98	Quantity
05-15065	MS28775-109	3/32	5/16	1/2	$0.59	Quantity
MS9388-016	MS9388-016	1/16	5/8	3/4	$0.75	Quantity
AN6227B-8	MS28775-110	3/32	3/8	9/16	$0.49	Quantity
AN6227B-9	MS28775-111	3/32	7/16	5/8	$0.95	Quantity
AN6227B-10	MS28775-112	3/32	1/2	11/16	$0.92	Quantity
AN6227B-11	MS28775-113	3/32	9/16	3/4	$0.77	Quantity
AN6227B-12	MS28775-114	3/32	5/8	13/16	$0.53	Quantity
AN6227B-13	MS28775-115	3/32	11/16	7/8	$0.89	Quantity
AN6227B-14	MS28775-116	3/32	3/4	15/16	$0.64	Quantity
05-04914	MS28775-117	3/32	13/16	1	$0.87	Quantity
MS28775-118	MS28775-118	3/32	7/8	1-1/16	$0.74	Quantity
05-04915	MS28775-119	3/32	15/16	1-1/8	$0.80	Quantity
05-04916	MS28775-120	3/32	1	1-3/16	$0.74	Quantity
05-04917	MS28775-121	3/32	1-1/16	1-1/4	$1.16	Quantity
05-04918	MS28775-122	3/32	1-1/8	1-5/16	$0.92	Quantity
05-04919	MS28775-123	3/32	1-3/16	1-3/8	$1.40	Quantity
05-04920	MS28775-124	3/32	1-1/4	1-7/16	$0.84	Quantity
05-04921	MS28775-125	3/32	1-5/16	1-1/2	$1.04	Quantity
05-04922	MS28775-126	3/32	1-3/8	1-9/16	$1.03	Quantity
05-04923	MS28775-127	3/32	1-7/16	1-5/8	$1.02	Quantity
05-04924	MS28775-128	3/32	1-1/2	1-11/16	$2.41	Quantity
05-04925	MS28775-129	3/32	1-9/16	1-3/4	$2.52	Quantity
05-04926	MS28775-130	3/32	1-5/8	1-13/16	$1.34	Quantity
05-04927	MS28775-131	3/32	1-11/16	1-7/8	$2.68	Quantity
05-00850	MS28775-132	3/32	1-3/4	1-15/16	$2.08	Quantity
05-05142	MS28775-134	3/32	1-7/8	2-1/16	$1.54	Quantity
05-05143	MS28775-135	3/32	1-15/16	2-1/8	$1.57	Quantity
05-05144	MS28775-136	3/32	2	2-3/16	$1.57	Quantity
05-05145	MS28775-137	3/32	2-1/16	2-1/4	$1.66	Quantity
05-05146	MS28775-138	3/32	2-1/8	2-5/16	$1.65	Quantity
05-05147	MS28775-139	3/32	2-3/16	2-3/8	$1.72	Quantity
05-05148	MS28775-140	3/32	2-1/4	2-7/16	$1.61	Quantity
05-05149	MS28775-141	3/32	2-5/16	2-1/2	$1.73	Quantity
05-05150	MS28775-142	3/32	2-3/8	2-9/16	$1.70	Quantity
05-05151	MS28775-143	3-32	2-7/16	2-5/8	$1.84	Quantity
05-05152	MS28775-144	3/32	2-1/2	2-11/16	$1.95	Quantity
05-05153	MS28775-145	3/32	2-9/16	2-3/4	$1.77	Quantity
05-05154	MS28775-146	3/32	2-5/8	2-13/16	$1.95	Quantity
05-05155	MS28775-147	3/32	2-11/16	2-7/8	$2.32	Quantity
05-05156	MS28775-148	3/32	2-3/4	2-15/16	$2.18	Quantity
05-05157	MS28775-149	3/32	2-13/16	3	$1.93	Quantity
AN6227B-15	MS28775-210	1/8	3/4	1	$0.86	Quantity
AN6227B-16	MS28775-211	1/8	13/16	1-1/16	$0.97	Quantity
AN6227B-17	MS28775-212	1/8	7/8	1-1/8	$0.86	Quantity
AN6227B-18	MS28775-213	1/8	15/16	1-3/16	$1.50	Quantity
AN6227B-19	MS28775-214	1/8	1	1-1/4	$0.90	Quantity
AN6227B-20	MS28775-215	1/8	1-1/16	1-5/16	$1.03	Quantity
AN6227B-21	MS28775-216	1/8	1-1/8	1-3/8	$1.36	Quantity
AN6227B-22	MS28775-217	1/8	1-3/16	1-7/16	$1.17	Quantity
AN6227B-23	MS28775-218	1/8	1-1/4	1-1/2	$1.14	Quantity
AN6227B-24	MS28775-219	1/8	1-5/16	1-9/16	$1.50	Quantity
AN6227B-25	MS28775-220	1/8	1-3/8	1-5/8	$1.28	Quantity
AN6227B-26	MS28775-221	1/8	1-7/16	1-11/16	$1.35	Quantity
AN6227B-27	MS28775-222	1/8	1-1/2	1-3/4	$1.45	Quantity
AN6230B-1	MS28775-223	1/8	1-5/8	1-7/8	$2.80	Quantity
AN6230B-2	MS28775-224	1/8	1-3/4	2	$1.55	Quantity
AN6230B-3	MS28775-225	1/8	1-7/8	2-1/8	$1.69	Quantity
AN6230B-4	MS28775-226	1/8	2	2-1/4	$1.65	Quantity
AN6230B-5	MS28775-227	1/8	2-1/8	2-3/8	$2.08	Quantity
AN6230B-6	MS28775-228	1/8	2-1/4	2-1/2	$1.93	Quantity
AN6230B-7	MS28775-229	1/8	2-3/8	2-5/8	$4.50	Quantity
AN6230B-8	MS28775-230	1/8	2-1/2	2-3/4	$2.14	Quantity
AN6230B-9	MS28775-231	1/8	2-5/8	2-7/8	$2.02	Quantity
AN6230B-10	MS28775-232	1/8	2-3/4	3	$5.35	Quantity
05-01013	MS28775-233	1/8	2-7/8	3-1/8	$2.51	Quantity
05-05158	MS28775-236	1/8	3-1/4	3-1/2	$4.35	Quantity
05-05159	MS28775-237	1/8	3-3/8	3-5/8	$3.55	Quantity
05-05160	MS28775-238	1/8	3-1/2	3-3/4	$3.55	Quantity
05-05161	MS28775-239	1/8	3-5/8	3-7/8	$3.35	Quantity
05-05162	MS28775-240	1/8	3-3/4	4	$4.35	Quantity
05-05163	MS28775-241	1/8	3-7/8	4-1/8	$1.89	Quantity
05-05164	MS28775-242	1/8	4	4-1/4	$3.75	Quantity
05-05165	MS28775-243	1/8	4-1/8	4-3/8	$2.83	Quantity
04-03882	MS28775-244	1/8	4-1/4	4-1/2	$4.35	Quantity
05-05166	MS28775-245	1/8	4-3/8	4-5/8	$1.97	Quantity
05-05167	MS28775-246	1/8	4-1/2	4-3/4	$3.65	Quantity
05-05168	MS28775-247	1/8	4-5/8	4-7/8	$3.35	Quantity
AN6230-28	MS28775-250	1/8	5	5-1/4	$3.80	Quantity
MS28775-261	MS28775-261	1/8	6-3/4	7	$12.50	Quantity
MS28775-267	MS28775-267	1/8	8-1/4	8-1/2	$8.90	Quantity
05-15403	MS28775-272	1/8	9-1/2	9-3/4	$10.50	Quantity
AN6227B-28	MS28775-325	3/16	1-1/2	1-7/8	$1.61	Quantity
AN6227B-29	MS28775-326	3/16	1-5/8	2	$1.71	Quantity
AN6227B-30	MS28775-327	3/16	1-3/4	2-1/8	$3.65	Quantity
AN6227B-31	MS28775-328	3/16	1-7/8	2-1/4	$3.75	Quantity
AN6227B-32	MS28775-329	3/16	2	2-3/8	$2.23	Quantity
AN6227B-33	MS28775-330	3/16	2-1/8	2-1/2	$2.27	Quantity
AN6227B-34	MS28775-331	3/16	2-1/4	2-5/8	$3.35	Quantity
AN6227B-35	MS28775-332	3/16	2-3/8	2-3/4	$3.55	Quantity
AN6227B-36	MS28775-333	3/16	2-1/2	2-7/8	$3.35	Quantity
AN6227B-38	MS28775-335	3/16	2-3/4	3-1/8	$3.35	Quantity
AN6227B-39	MS28775-336	3/16	2-7/8	3-1/4	$3.70	Quantity
AN6227B-40	MS28775-337	3/16	3	3-3/8	$9.80	Quantity
AN6227B-41	MS28775-338	3/16	3-1/8	3-1/2	$4.85	Quantity
AN6227B-42	MS28775-339	3/16	3-1/4	3-5/8	$4.35	Quantity
AN6227B-43	MS28775-340	3/16	3-3/8	3-3/4	$3.90	Quantity
AN6227B-44	MS28775-341	3/16	3-1/2	3-7/8	$4.40	Quantity
AN6227B-45	MS28775-342	3/16	3-5/8	4	$4.35	Quantity
AN6227B-46	MS28775-343	3-16	3-3/4	4-1/8	$3.35	Quantity

Subtotal $0.00

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Overview
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Overview

O-rings give effective sealing over wide ranges of pressure, temperature, and movement, with the advantage of sealing pressure in both directions and reducing friction and wear on moving parts. The use of O-rings as gaskets or static seals permits metal-to-metal contact and allows almost unlimited pressures under extreme vibration.

All O-rings should be lubricated before installation and constant lubrication should be provided for running seals to avoid excessive wear. Avoid sharp edges, threads, and cross-drilled ports over or through which rings must be installed. AN6227B and AN6230B O-rings are manufactured to Spec. MIL-P 25732 for use in hydraulic systems using MIL-0-5606 hydraulic oils. MS28775 O-rings meet Spec. MIL-P- 5510A and are suitable for MIL-0-5606 hydraulic fluid at 160 F.

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Reviews

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as described

George S

Verified Purchase

O-RINGS AN6227B-20 MS28775-215

April 23, 2022

as described

George S

Verified Purchase

O-RING AN6227B-6 MS28775-011

April 23, 2022

as described

George S

Verified Purchase

O-RINGS AN6227B-4 MS28775-009

April 23, 2022

Luca B

Verified Purchase

O-RING MS28775-027

April 13, 2022

Jeff A

Verified Purchase

O-RINGS AN6227B-19 MS28775-214

April 8, 2022

Jeff A

Verified Purchase

O-RINGS AN6227B-21 MS28775-216

April 8, 2022

Very happy I could not find the correct order number but spruce provided it--perfect

Bill R

Verified Purchase

O-RING AN6227B-27 MS28775-222

April 7, 2022

The part arrived quickly, was in excellent condition, and was the correct dimensions required for the job.

Nancy E

Verified Purchase

O-RINGS AN6230B-2 MS28775-224

April 6, 2022

The part arrived quickly, was in excellent condition, and was the correct dimensions required for the job.

Nancy E

Verified Purchase

O-RING AN6227B-27 MS28775-222

April 6, 2022

The part arrived quickly, was in excellent condition, and was the correct dimensions required for the job.

Nancy E

Verified Purchase

O-RINGS AN6227B-5 MS28775-010

April 6, 2022

The part arrived quickly, was in excellent condition, and was the correct dimensions required for the job.

Nancy E

Verified Purchase

O-RING MS28775-015

April 6, 2022

Jeff A

Verified Purchase

O-RING AN6227B-27 MS28775-222

April 6, 2022

Jeff A

Verified Purchase

O-RINGS AN6230B-6 / MS28775-228

April 6, 2022

Jeff A

Verified Purchase

O-RINGS AN6227B-32 MS28775-329

April 6, 2022

Mil-Spec part... it was called out in the drawing and fit fine.

Doug D

Verified Purchase

O-RING AN6227B-27 MS28775-222

March 22, 2022

Adam

Verified Purchase

O-RINGS AN6230B-2 MS28775-224

March 19, 2022

Well, my shock strut is sitting up and appears to be holding up quite well.

Brandon W

Verified Purchase

O-RINGS AN6227B-31 MS28775-328

March 15, 2022

great Product

Usa I

Verified Purchase

O-RINGS AN6230B-2 MS28775-224

March 12, 2022

I keep several of these in my toolbox so they are readily available when changing out brake pads.

Paul A

Verified Purchase

O-RINGS AN6227B-23 MS28775-218

March 5, 2022

Grant M

Verified Purchase

O-RING AN6227B-27 MS28775-222

February 26, 2022

William J

Verified Purchase

O-RINGS AN6227B-23 MS28775-218

February 23, 2022

👍

William T

Verified Purchase

O-RINGS AN6227B-23 MS28775-218

January 29, 2022

Crafton M

Verified Purchase

O-RINGS AN6230B-2 MS28775-224

January 14, 2022

Rickylee M

Verified Purchase

O-RING MS28775-124

January 12, 2022

The O-ring to fit the Cleveland brake piston for Beechcraft Debonairs and Piper Cherokees.

Blane J

Verified Purchase

O-RING AN6227B-27 MS28775-222

December 29, 2021

Ive had success with this O-ring in a pitted Cleveland brake cylinder for 7 years.

Blane J

Verified Purchase

O-RING AN6227B-27 MS28775-222

December 9, 2021

Lowry W

Verified Purchase

O-RINGS AN6227B-8 MS28775-110

November 25, 2021

Lowry W

Verified Purchase

O-RINGS AN6227B-14 MS28775-116

November 25, 2021

Lowry W

Verified Purchase

O-RINGS AN6227B-5 MS28775-010

November 25, 2021

Fumigaciones A

Verified Purchase

O-RING AN6227B-27 MS28775-222

November 9, 2021

Exact replacement fit for the Parker/Cleveland brake calipers on my A36 Bonanza. One of my calipers were showing signs of a slight leak. Replaced the leaking/old O-rings with these and no more leaks. To fully service the Cleveland caliper on an A36 Bonanza you will replace two of these O-rings. You will need 4 O-rings if you are servicing two calipers.

Scott S

Verified Purchase

O-RING AN6227B-27 MS28775-222

October 26, 2021

Excellent product

Kenneth M

Verified Purchase

O-RINGS AN6227B-23 MS28775-218

October 16, 2021

Ralph S

Verified Purchase

O-RINGS AN6230B-6 / MS28775-228

September 26, 2021

Ralph S

Verified Purchase

O-RINGS AN6227B-23 MS28775-218

September 26, 2021

Exact fit for my brake piston.

Timothy R

Verified Purchase

O-RINGS AN6230B-2 MS28775-224

September 25, 2021

Charles

Verified Purchase

O-RINGS AN6230B-6 / MS28775-228

September 20, 2021

These O rings make for an easy repair of Cleveland brakes leaking 5606.

Blane J

Verified Purchase

O-RING AN6227B-27 MS28775-222

September 17, 2021

Very happy with experience right parts showed up next day

Fred H

Verified Purchase

O-RINGS AN6227B-5 MS28775-010

September 2, 2021

An O ring is an O ring.

Siskiyou A

Verified Purchase

O-RINGS AN6230B-2 MS28775-224

August 19, 2021

Quality part !!

George K

Verified Purchase

O-RINGS AN6227B-7 MS28775-012

August 15, 2021

just hardware

Keith P

Verified Purchase

O-RINGS AN6230B-2 MS28775-224

August 13, 2021

Douglas E

Verified Purchase

O-RINGS AN6227B-23 MS28775-218

July 21, 2021

o-ring fit project well

Ronald E

Verified Purchase

O-RINGS AN6227B-3 MS28775-008

July 6, 2021

o-ring fit project well

Ronald E

Verified Purchase

O-RINGS AN6227B-9 MS28775-111

July 6, 2021

o-ring fit fit project well

Ronald E

Verified Purchase

O-RING AN6227B-6 MS28775-011

July 6, 2021

o-ring fit project well

Ronald E

Verified Purchase

O-RING MS28775-014

July 6, 2021

Thank you for the cross reference

Infinity A

Verified Purchase

O-RINGS AN6230B-9 MS28775-231

July 6, 2021

Thank you for the cross reference

Infinity A

Verified Purchase

O-RINGS AN6227B-33 MS28775-330

July 6, 2021

Thank you for the cross reference

Infinity A

Verified Purchase

O-RINGS AN6230B-10 MS28775-232

July 6, 2021

Laurence G

Verified Purchase

O-RINGS AN6230B-2 MS28775-224

July 2, 2021

Good replacement o-rings when you need them.

William J

Verified Purchase

O-RINGS AN6230B-2 MS28775-224

June 10, 2021

AS described. As always great service

Central A

Verified Purchase

O-RING AN6227B-27 MS28775-222

May 29, 2021

Correct O ring for P 28R brake cylinder

Dan V

Verified Purchase

O-RINGS AN6227B-23 MS28775-218

May 27, 2021

Didnt have a part number and was surprised that your outstanding folks couldnt find it right off hand. Once I called back with the part number, no problem. And your phone folks are always fun to talk to. Ed

Ed W

May 12, 2021

--quick delivery, tracking, --individually packaged o rings, manufacture date and specs on each envelope. --i also ordered from another company, (original manufacture of the hydraulic swivel), to ensure product delivery during covid pandemic. i did not use the other product eventhough i paid for a faster priority delivery, and it arrived a day sooner, with ups, those rings were all in one bag and appeared to have been produced 9 years ago, and were more expensive. also a third possible source, a local hydraulic supply company wanted 6 times more money then aircraft spruce, which had to be shipped frim another state, for the same o rings, of unknow origin, quality and specs. i did not order those. --aircrat spruces product looked better and i had the confidence of manufacture date. --the o rings i replaced failed from age, not wear. the hydraulic swivel containing them was difficult to remove and install. they work well and i have the confidence they will last another 20 plus years. the original ones lasted 50 plus years.

Steven

March 16, 2021

Mil Spec...are there any better?

Kurt R

January 18, 2021

This is the o-ring that keeps the hydraulic oil in your brake calipers. Keep plenty on hand. Pay either 87 cents for this one or $22.70 apiece for the ones from Cleveland.

Gordon

December 7, 2020

The MS28775-xxx / AN6227B-xx are the hydraulic fluid resistant O-Rings that I use in the brake system of my Beech 19A. Each O-Ring comes in its own separate well marked bag - hence they store / age well and you know that what they are and that they are new.

Bruce B

November 25, 2020

I have not utilized the O rings as of yet, but they look good and will replace old/worn out O rings in the engine baffles.

Lynn N

October 21, 2020

excellent service

Alex G

September 22, 2020

They are round, flexible, and new. They prevent hydraulic fluid from leaking better then old, stiff, oval ones.

Dan P

July 15, 2020

No Leaks!!!!

Roland F

June 6, 2020

Order received as ordered on time and in new condition.

Alfred S

May 31, 2020

The O-rings were the correct ones as per the advice of the sales associate and they worked perfectly. Thanks.

Lee K

May 25, 2020

O-rings are O-rings not much to be said about them — But your service on this and several previous orders has been just “OUTSTANDING” blindingly fast and always accurate....even on small orders — thank you Wally

Walter E

May 3, 2020

Great

Bill A

April 25, 2020

Fast delivery

Gordon

February 28, 2020

Correct ring for use on this valve assembly. No leaks detected after use and long flight to Texas. Previous attempts at stopping a very slow leak were unsuccessful.

Jess L

February 13, 2020

Great jumping Jehoshaphat!! What a really great O ring. Its black and round and the right size!!

Donald B

January 26, 2020

Always a please doing business with yall keep up the good work and Merry Christmas... Rick

Richard D

December 18, 2019

Perfect fit to repair a leaky brake cylinder on my RV8A. Much cheaper than the Cleveland part, too.

Rob H

December 11, 2019

It was perfectly round.

Joe H

December 7, 2019

Delivered quickly and on time

Doug H

November 21, 2019

Great product, easy ordering.

Ed G

November 8, 2019

If you have a older Beech Debonair this fits the emergency gear extension hand crank seal .

Gregory M

September 13, 2019

It Arrived lov.flk.

F. L

September 8, 2019

Nice ladies always helpful. lov.flk.

F. L

August 30, 2019

This purchase was an experiment. I needed a seal for my 2005 Subaru Baja engine oil cooler. The site is excellent and well organized. I was able to measure the ring land and easily locate an exact fit. I could not find another site at this price point to quickly find what I needed.

William T

May 31, 2019

Nicely labeled, well packaged, and fresh dates. Just what I needed at the time I needed them.

Cris A

January 31, 2019

Super Customer Care

Carrell C

November 29, 2018

Best deal in town! I changed out o rings in both of my cng trucks and have extras for emergencies too.

Douglas E

October 20, 2018

Shipping was fast and it was the correct part

Richard L

August 9, 2018

Wow! They were circular and made of rubber. They also fixed my brake problem. What more can you ask for?

Meandude

March 9, 2018

Rocket A

January 18, 2018

Kerry

October 27, 2017

Great product.

Jp H

September 7, 2017

Works as advertised . Sky King

Rich B

August 18, 2017

O-rings individually wrapped and sealed to extend their life with composition, date and size insure these are AN/aircraft approved quality

James M

June 18, 2017

These o-rings come in a plastic bag which includes a cure date. So you can know how old they are. Very handy.

Charles D

April 13, 2017

Charles

Verified Purchase

O-RINGS AN6227B-33 MS28775-330

September 20, 2021

Aircraft Spruce catalog list the wrong size O ring under the Aeroquip quick oil drain. I did not catch the error until I received my order. I called customer service but they were no help. Then I was transferred to sales where the error was confirmed and the correct O ring sent no charge.

Milton B

June 8, 2018

Q&A

Please note, Pilotshop's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Pilotshop assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Can these O rings be used in fuel cells with 100LL fuel?

These o-rings, AN6227B series, are not fuel resistant. For fuel resistant o-rings, see the MS29513 series. MS29513 are aviation fuel resistant, but not resistant to automotive fuel. Search for MS29513 on our web site to find the page with the fuel resistant o-rings.

Q: Are the O-rings Butyl rubber?

These are POLYTETRAFLUOROETHYLENE per the mil spec.

Q: What is the shelf life of these o-rings?

15 years per the cert.

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