I checked on these
above-waterline thru-hull valves and here is what I found. The elbow in this assembly is NPT. The valve itself where it meets the thru-hull is straight thread compatible. These are 3/4 inch thru-hulls. They are under/almost inside and protected by the bulwark.
The threaded thru hull is apparently made so that a backing plate can be used and would make their appearance much shorter. The picture probably exaggerates their appearance due to being in the foreground.
This is the company purchased from:
http://www.yongxiangvalve.com/
Also, the below water seacocks look very different from these with backing plates, etc
Quote:
Originally Posted by cardude01
Yeah I would not really worry about thread mismatch with above water valves. But supposedly, someone correct me if I'm wrong, if you accidentally step on one or drop something on one the valve could break off since only a few threads grab.
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