Quick replacement for the gray water drain tube cap?

I have replaced my black and gray water caps with these from Amazon. I keep a spare on hand.

http://www.amazon.com/Valterra-Products-T1020-Termination-Bayonet/dp/B0006N5RW2?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o06_s00

http://www.amazon.com/Valterra-T1020-1-Black-Waste-Valve/dp/B0006N5RYK?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o06_s00

Any RV parts department (not the salespeople) will know exactly what you need. It's a gray water outlet cap (bayonet style) - although many parts people call them "termination caps" (http://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias=aps&field-keywords=termination+cap). Unfortunately, this is one of those small things Amazon Prime won't ship alone unless you get $35 of something else with it.

Many KOAs keep things like that in stock, so if there's one nearby you, give them a call to see if they have one in stock.

I lost mine down the road as well and had to replace it on my 2nd outing. No clue where it bounced away... there's probably a "Gray Cap" secret gathering place where they tell stories about us!