Part# 05-29507
MFR Model# FS20X3-F R2
Part No.ModelDescriptionPorts


There are two main categories of valves that are produced by Andair.

The Standard range incorporates the 3/8"(FS20) and the 1/2"(FS25) Selector Valves. These valves allow for multiple tank switching of one fuel line.

The other type is the Duplex valve. These units have two separate compartments that allow for two fuel lines to be switched simultaneously. These valves are used for fuel injected engines that require the fuel to be returned to the tank from which it was drawn from.

Each fuel selector has some great features that make it different from the rest. To begin with, the valve operates using a brass ball valve that is highly polished before assembly, then a PTFE gland is packed against it. The feel of the valve is very smooth. Click for exploded view of seal assembly. A number of design features allow a positive selection action. There is a large red ever with 'Fuel' engraved on it and a clearly labelled fascia plate to indicate which tank has been selected. The lever also incorporates a safety detent mechanism. This feature acts in two ways. It allows for a good solid detent at each tank position and also the button on top of the lever must be raised to switch the fuel off. All these features help prevent the pilot switching the wrong tank or turning the fuel off. Click for exploded view of lever assembly.

All of the valves produced can be supplied with a choice of fittings, an extension and even custom engraving.
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


Not only is this a nice looking installation it works smoothly! A little pricey for experimental but in my opinion worth it!

James G
October 31, 2020

Best fuel valve. I have two of them. Very nice feeling instead of wondering if the valve is going to break as I wonder with brass valves.

Alfred C
August 26, 2017


Please note,'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. 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: Are the Andair FS250 fuel valves FAA Approved for use in certified aircraft?

No, they are intended for use in experimental aircraft only.

Q: Are all 3 fittings AN-6 male on the 05-02635 Andair FS20x4M fuel selector valve?

Yes, these are all AN6.

Q: The FS20X1F are the ports AN6?, and how many ports?

It has two female 1/4 npt ports. The FS20x1M would have two male AN6 fittings.

Q: Does Andair have a valve available for four tanks left & right Main, left & right Auxilary?

The FS20x8 valve is a 5 way valve (4 tanks and off).

Q: Are fs20x4-f fuel selectors approved for certified aircraft ?

No. These are for experimental aircraft only.

Q: Does the FS20X7-T have left and right inputs that can point down?

Per the vendor, "The set-up of this valve is such that the LEFT and RIGHT tank positions are at 45 degrees to the center line of the aircraft. "