Does anyone make a thru hull plugs to replace thru hull fittings?

[Chinookie]

My 1997 228 has old plastic thru hulls, and I want to get rid of ALL the ones below the water line. I don't ever plan to use any of the live wells for several reasons, foremost is the chore of cleaning them afterwards. I also don't like the idea of below waterline thru hulls and hose that can fail 40 miles out. I would like to replace those hoses and fittings with a fitting that seals snug with a flat face and o ring and threaded shaft and nut. I haven't been able to locate any but surely someone makes them? Thanks for the help!

 

[seasick]

I am not sure you want to do that. If you basically remove thru hulls, what will you do with the hoses that fed them. For example, you mention the live well. If you take away the drain , what happens when water gets into the supported equipment. In other words if rain water or se water happens to get into the livewell, how does it get out. Same thing applies for deck and locker drains. Plastic per se is not a good material for below the water line but there are fittings made of Marelon, a composite material which wont corrode or break down. Many manufacturers use Marelon fittings for below the water line.

 

[seasick]

Here is one approach. Lots of work,

Plugging an Old Thru-Hull Hole

> How-To Plugging an Old Through-Hull Hole One popular upgrade to many boats is electronics. Along with vastly upgraded plotters, network systems, Wi-Fi connections, the thru-hull transducer units themselves have evolved over the years as well. The electronics are now housed inside the...

boatnotes.com

 

[DennisG01]

If you have plastic fittings below the waterline... get those out of there right away. They shouldn't be there to start with.

If you have Marelon fittings, that's different and perfectly fine.

Do they not have a seacock? You can just close that. Or remove the seacock and put a cap on the threaded pipe.

Got an old, non-working thru-hull transducer laying around? That'd work as a plug. Maybe a friend has one on a shelf?

 

[SeanC]

You’re not talking about blocking the scuppers I presume.

 

[Sardinia306Canyon]

My 1997 228 has old plastic thru hulls, and I want to get rid of ALL the ones below the water line.

I would close them with non swelling plugs, if you want to do it better replace them with bronze ones but thats expensive, the thru-hulls and the work to replace them. Non swelling as if it's a wooden dowel it will swell and my crack the "plastic" thru-hull.
On my boat i would use a micrometric less diameter plastic rod glued in with 5200 or screw a cap on as Dennis already suggested, but better plugging from outside than from inside. The cap would make reverting to working thru-hull much simpler.

You most likely have Marelon thru-hulls and they can be confused with "plastic" ones but are a superior material, but you may ask GW what they used then.
My 1998 BW 23 Outrage had white "plastic" thru hulls above the water line and they became rough from antifouling on them, but not sure what maerial it was, a kind of nylon/POM or already Marelon.

Chris