Dick,
Do not use the ones with a washer! The washer over time will harden, crack, dissolve, and be a source for leaks. Just use vulcem when you install them.
I do not think there are different lengths. The standard ones Inland sells have worked for me in all cases.
The 5/32 is the correct size
__________________
Brett G
WBCCI #5501 AIR # 49
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1978 Argosy 28 foot Motorhome
Wise men talk because they have something to say; fools, because they have to say something. -- Plato
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