[C320-list] Deck diesel fill cap

[Jerry's Iphone]

I dropped my diesel fill cap in the water recently. I found a replacement at West Marine but it’s not a perfect fit. I’m concerned about water getting in. I searched Catalina direct and Catalina parts with no success. Catalina Direct sells the stainless caps with the pipes but don’t see the need to replace all but may have to. 

Any other ideas?

Jerry Sheets
JellyRoll   2002   #890