there is no such thing as "Forest River Design" water cap, at least on TT's and popups. they are a RV standard item that is used for all manufacturers.
but since you don't list what RV you have, other types of RVs may be different.
but never seen a locking cap for the standard type of fresh water fill neck.
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Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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