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Old 05-27-2022, 02:46 PM   #1
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City: St. Louis, MO
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Replacing Really Old Thru-Hull

The thru-hull on our Stb engine froze up this past visit to the boat and after trying pretty much everything to get it free we decided to replace it. The problem is that it's a very old (probably 1989 original) thru hull and ball valve that I don't see available anywhere. Most of the newer thru-hulls have the nut on the inside of the hull, but our base plate is much larger and I have my doubts as to whether the nut would grab sufficiently. The nut on the one we have has a very large flange. Here is a photo of the unit less the outside flange which we ground off.





Our base plate:




There is no manufacturer on the thing, only 1-1-2" size and 500 WOG which is Water-Oil_Gas so I'm assuming that Kha Shing didn't use a marine thru-hull. At this point we're looking at possibly using this thru-hull as a replacement: https://www.perko.com/catalog/underw..._valve_design/


The seacock choice rather than a standard thru-hull and ball valve was made as a result of reading this very fine article:


https://marinehowto.com/replacing-th...-and-seacocks/


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Old 05-27-2022, 11:38 PM   #2
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When I saw your photo, I thought it was a Perko seacock.
When you install a seacock you donít use the nut that comes with the thru-hull fitting. The seacock acts as the nut.
The Perko seacocks are excellent. I like Groco that are also excellent because you can buy a pre made backing plate for them.
https://www.groco.net/products/valve...lves/bv-series
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Old 05-28-2022, 07:34 AM   #3
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Quote:
Originally Posted by HopCar View Post
When I saw your photo, I thought it was a Perko seacock.
When you install a seacock you donít use the nut that comes with the thru-hull fitting. The seacock acts as the nut.
The Perko seacocks are excellent. I like Groco that are also excellent because you can buy a pre made backing plate for them.
https://www.groco.net/products/valve...lves/bv-series
Itís definitely not a Perko. Iíve looked at the Perko, and ours has a similar backing plate fiberglassed onto the hull, but ours isnít through bolted to the hull. Itís just sealed and the nut screwed down on the backing plate then the ball valve is screwed on. The difference is that the nut has a large flange rather than the small nuts that come with the current thru hulls available. I think at this point weíll probably go with the Perko seacock that has the large round flange rather than the triangle one.
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