This is the drain plug assy. from one of those Pond Prowler two man plastic pontoon boats. The part in question is the one in the middle of the picture. It's a very flexible seal that seems to be made of silicon or something similar. Google doesn't do me any good if I don't know what I'm looking for

Thats the Jesus washer. When it fails "Jesus, we're sinking!"

It looks like it was 100% clear silicone that was applied when everything was clean.
Just clean everything up again and re-apply silicon. Tighten up and wipe off excess.

Looks similar in size and shape to a bathtub drain. Plumbers putty for a repair? What do I know, never owned a pontoon boat.

gasket ?

Round silicone gasket.

quote:

Originally posted by Mustang-PaPa:
It looks like it was 100% clear silicone that was applied when everything was clean.
Just clean everything up again and re-apply silicon. Tighten up and wipe off excess.

I think you hit the nail on the head. After looking closer, that's about the only way to explain the distinct thread marks on the inside. I hadn't even thought in that direction.

Thanks

Looks like a signal the plug was slightly undersized for the hole....

Its a bulkhead fitting and they do use gaskets. You can probably find them at your local hardware or big box store.

That's the same type bulkhead fitting also used for bilge pumps and overboard discharges in boats. You might find what you need at West Marine or similar.

Heavier versions on larger/commercial boats usually are brass/bronze/stainless.

I believe that is a non-reversible tremmie pipe

When I looked at the picture, it looked like the part of the pool filter that goes through swimming pool liner.

quote:

Originally posted by olfuzzy:

quote:

Originally posted by Mustang-PaPa:
It looks like it was 100% clear silicone that was applied when everything was clean.
Just clean everything up again and re-apply silicon. Tighten up and wipe off excess.

I think you hit the nail on the head. After looking closer, that's about the only way to explain the distinct thread marks on the inside. I hadn't even thought in that direction.

Thanks

Yep, that's my take!

You can use 3M 4200 Marine sealant if you want whatever you attach removable in the future or 5200 if the fitting is NEVER to be removed. Usually find it at a WalMart, Cabela's, Autozone, local boat store, etc or any place that has marine products. The 4200 is far better than your run of the mill household clear sealant.

I also agree based on the size of the silicone "plug" that somebody was just filling space with the silicone. May be better off looking for a better part for a more correct solution. West marine may be a good source as would www.Defender.com

If you Google "pond prowler drain plug" lot's of options come up.

Maybe a gasket and seal that has taken the shape of the threads over the years and not silicone caulk?

quote:

Originally posted by Sailor1911:

I also agree based on the size of the silicone "plug" that somebody was just filling space with the silicone. May be better off looking for a better part for a more correct solution. West marine may be a good source as would www.Defender.com

If you Google "pond prowler drain plug" lot's of options come up.

This wasn't a "Bubba job", I bought the boat new at BassPro about 3 years ago.

quote:

Originally posted by olfuzzy:

quote:

Originally posted by Sailor1911:

I also agree based on the size of the silicone "plug" that somebody was just filling space with the silicone. May be better off looking for a better part for a more correct solution. West marine may be a good source as would www.Defender.com

If you Google "pond prowler drain plug" lot's of options come up.

This wasn't a "Bubba job", I bought the boat new at BassPro about 3 years ago.

Really! Well maybe it was a "quality control" solution at the factory. From the pics, it sure looks like Bubba did it.

I've never seen one with a clear gasket, usually black rubber.

That's probably Lexel or something similar.

You can cut a new gasket from a rubber inner tube, or use a good o-ring from the local Auto parts store.

quote:

Originally posted by Sailor1911:
From the pics, it sure looks like Bubba did it.

You could be right, seems China has a word for Bubba too.

bubba

offensive a white, uneducated man from the southern US

美国南方未受过教育的白种男人

quote:

Pond Prowler two man plastic pontoon

As was noted its a thru hull fitting. They do not use gaskets typically but are sealed with some form of sealant. The sealant does two functions it prevents leaks and it prevents water from reaching the boat hull which on some forms of boat construction is cored and water intrusion is a serious issue. In your case if the hull is plastic that's not a serious issue but it needs to be sealed properly. I would never use 4200 or 5200 on such a plastic fitting, they eventually need replacement. As a side note these fittings are really cheap so I wouldn't reuse one either. A good marine grade sealant is what you need but the best ones are not suitable for plastics (or at least have to be tested about it). So likely I'd use some form of silicon based product, I normally would use 3M marine grade silicon, but there are a lot of similar products.