Need Waste cap

[dazeoff-wy]

Last day of the season last year final pump out of the summer [:-dunce] cap goes to the bottom of the marina[:-censored]. Problem I can't find a replacement the right size. Me opening measures 1 3/4" at the threads but all I can find are 1 1/2" caps. this is on a 1987 carver 2757 any suggestions

 

[Tanqueray]

Just replace the whole thing. You'll drive yourself nuts looking for the replacement cap. It'd be quicker and easier to just replace the assembly. Just remove the screws and the flange will come out leaving enough room to unclamp the hose and put it on a new one.