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One caution with Marelon, at least if it has a ball valve; it has to be lubricated every so often. Not a big deal, but something to be aware of. Or so I've read. I've had Marelon thru-hulls, but they didn't have valves. But I did keep some tapered wooden plugs, just in case a thru-hull had to be plugged.

I never lubed the bronze thru-hulls in my last boat, most of which were below the water line (engine and head intakes, for instance), and as long as they're exercised every once in a while, they worked fine. But for an above the waterline drain like that, nylon or Marelon would be fine, IMO.

I get the impression that Marelon is a brand name of Forespar and that the composite materials used by Forespar and Trudesign are very similar, if not the same. Both very strong and durable.
Furthermore, Forespar mentions "PTFE" and Trudesign mentions "Teflon" to ensure troublefree operation as long as the ball-valves are operated every now and then. And we all know that PTFE and Teflon are the same stuff. It seems odd to me that either of the two makes would require any form of additional lubrication.

My hast that white plastic through hull under the waterline for the drain of the kitchen and motor well. Factory mounted! So I guess it should be strong enough even in winter and when the lake gets frozen or in salt water... !!! ????

kurz wrote:My hast that white plastic through hull under the waterline for the drain of the kitchen and motor well. Factory mounted! So I guess it should be strong enough even in winter and when the lake gets frozen or in salt water... !!! ????

Below the waterline? That's different from the then. Kitchen, head sink and motor well drains are just above the waterline on the . Well, as long as the boat is not healing. Which is only when moored.

The thru hull on my for the sink and motor well drain is port side below the waterline. The one for the fresh water system is starboard above the water line - does the OP have a fresh water tank?

kurz wrote:My hast that white plastic through hull under the waterline for the drain of the kitchen and motor well. Factory mounted! So I guess it should be strong enough even in winter and when the lake gets frozen or in salt water... !!! ????

I think UV is the killer of those fittings. Ours is below water line only with people or heavy loads in the back. At dock with no one onboard it's just above, just. Try moving some stuff forward to see if you can balance it a bit better?

well will check next when my will be in the water again. Maybee for this reason I could empty the ballast tank next winter. So it will not stay in the water.
But will it be better? If it is not in the water maybe it will freeze more often...

I would recommend against leaving your boat in the water if the water is freezing. If that's how I'm reading that?

Neo wrote:Duck Tape ... takes on a new meaning here

Hey Neo. Duct tape can mend most everything but a broken heart and the crack of Dawn Ron.

yukonbob wrote:I would recommend against leaving your boat in the water if the water is freezing. If that's how I'm reading that?

Well my stays 365 day a year in the lake. So if in winter its get cold I can't take the boat out.

So 2 possibilities can happen:
The air temperature freezes
or if it stays very cold longer, even the lake freeze.

In both circumstances I had no problems so far ... til now...