Catalina Direct has custom made Stainless Steel caps that retro-fit our plastic (winch handle) tank covers.
http://www.catalinadirect.com/index.cfm/product/4150_752/deck-pipe-cap-diesel-stainless-steel.cfm
I ordered the Diesel tank cap with haste, as it seemed that it would protect from water. I received the cap and took it to the boat to install. Very nice quality cap, but oops... my boat was already upgraded to the "deck key" style fill. I guess that's what I get for not using very much fuel.
Anyway, would anyone like to take this very nice stainless steel diesel tank fill cover off my hands?
$40 delivered.
sold!