stainless steel cotter ring

[tro1952]

hello, i own a 1972 trojan 36 ft tri-cabin. does anyone know what size stainless steel cotter ring ,i should use on the fuel filler pipe or water tank. the fuel caps and water cap. i want to put a cable on them and shove a cotter ring down the pipe so the cap does not get lost overboard when filling water or gas. please let me know if you know what size ring.thanks

[prowlersfish]

Trojan used a ball chain screwed into the fill. do you have that now?

[tro1952]

hello, no .all i have is a fuel cap with a screw in it,no chain. i bought some cables online that are plastic coated about 10 inches came with a ring on it ,but its to small and comes right out .need a bigger ring .thanks terry