On May 10, 2:57 pm, "Roger Long" wrote:
This is one of those things...

The theoretical reasons for not putting a tapered thread ball valve on a
straight thread through hull are absolute and irrefutable. All the strain
is on just one or two threads. The stress is nearly infinite. The
electrical connections is through a very small amount of metal. It will
sink your boat. No question.

Roger Long


I've seen just that problem on an aluminum boat with bronze seacocks.
The surface contact is so small the electrolysis cuts thru the through
hull threads like a laser, they can just fall off. Was able to break
them all off by hand right before a USCG inspection.

Joe