Waste Pump out Cap

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Waste Pump out Cap

Postby levelwind » Mon Sep 14, 2015 5:49 pm


I am having trouble finding a replacement cap for our Jabsco waste pump out. It is the large fitting. The outside cap diameter is 2 1/8" and the thread is 1 7/8". I searched online and all seem to be too small. Any suggestions. Here's some pics.

2IMG_.JPG (22.99 KiB) Viewed 1854 times
1IMG_.JPG (25.12 KiB) Viewed 1854 times

3IMG_.JPG (43.64 KiB) Viewed 1854 times

Brian & Susan
Upper Niagara River
1981 Marinette
28ft Sedan FB
Twin Chrylser 318's
Raw water cooled

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Re: Waste Pump out Cap

Postby Busia » Tue Sep 15, 2015 2:53 am

Looks like it might be one and a half inch pipe thread. You can get plastic or stainless plugs. Take the old one to a plumbing supply house and find a fitting the plug fits, then a new plug that also fits. A pipe thread will have a taper ( 3/4 inch per foot ) a machine thread will be straight. Yours looks like a tapered pipe thread.
located in Ketchikan, Alaska. Gods country
32 foot Marinette express. (no fly bridge)
twin 350 Crusader (Chev 350) engines
1:1 Borg Warner velvet drive transmissions
Closed cooling (antifreeze in the engine)
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Re: Waste Pump out Cap

Postby jmonday » Wed Sep 16, 2015 12:08 pm

MSC, McMaster Carr or Grainger should have what you are looking for. It is a pipe thread so once you know what size it is (i.e. maybe go to the hardware store and get one that fits.) then look them up and order the one with the best looking outside shape. Hex square or key style they make different head designs.
Good Luck!
Jeff Monday (Blue Mondays)
1973 28 ft Express single 318 1976 StarCraft Islander 1961 Sea Nymph
Lower River rd
Rabbit Hash KY