Trojan Boat Forum

I'm installing a new, larger bilge pump, and I've already removed the old thru-hull connector. I noticed there was some type of sealer, caulking type material around the connector on the inside.

Wouldn't it cause the connector not to tighten properly, if this is applied?

Actually, when I grabbed it with my hand (the old one) it broke off in my hand?

Sure would like to know if it is proper to apply any kind of sealer when installing the new thru-hull connector. If it were below the water, I could understand the need.

Thanks.

Larry

The stuff I use is "3M 5200" for all my through hull fittings. Because the hull flexes, shrinks and swells with temperature changes, the caulking keeps the fitting from weeping. I installed one many years ago without caulking and it seeped water in heavy seas. Lesson learned.

4200 is a good sealer also boat life is another good one , I use 5200 when I never plan on removeing what I am installing

no no not 5200 you'll never get the fitting off again, 4200 or marine silicone for a above the water line thur-hull IMO

Larglo, be very careful. Many boats have sunk in the slip, having had a thru hull temporarily plugged or disconnected.

Personally, I would never use "sillycone" anywhere on a boat. Marine or otherwise. It will never last anywhere near as long as a polysulfide like 5200, 4200, etc. Largo, The main reason a sealant is used on through hulls above the waterline, including deck fittings, is to prevent moisture from entering the fibreglass, and core materials, causing delamination. A good surveyor will check these areas with a moisture meter and report negativly if excessive moisture is present. As a Yacht Broker, I have seen deals go sideways on this issue alone. jimbo36.

Had to re-order one with a 90 deg bend, but will use a sealer.

Thanks,

Larry