Bayonet knob in-line fuseholder. Supplied with 8" loop of 14-gauge wire and one spring to accommodate AGC fuses. Simple "twist-lock" allows easy fuse removal and replacement.
WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. www.P65Warnings.ca.gov
BAYONET KNOB FUSEHOLDER FHP-1
Mine was marked Littlefuse Inc P/N FHP1 and came with three springs. Tag says will work with SFE 7 1/2 - 9 - 14 - 20 and 3 AG fuses.
Unit comes with 3 internal springs and only provides codes for which to use. I am using it with a 1A AGC 1 and that option isnt shown. Should call for a fuse LENGTH to determine manufacturer recommended spring. Just makes it more difficult. Otherwise holder is adequate. Sure wish an aircraft part was more insulated from the elements.
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This appears to be automotive type wire. No milspec markings.