Weird 1990 Era Beneteau First combination Thru Hull Sea Cock

[nauticalnovice]

I should have taken pictures, but I'll do my best to describe:

Gray "thru-hull" sea-cock combination that has the plumbing attached via a 45 degree off shoot and the sea-cock portion of the arrangment has a stopper lever that expands contracts a rubber stopper that can be lifted out of the way of the 45 degree junction when not expanded and lowered to stop water ingress.

Anyone know what I'm talking about?

I'm not really looking for replacements, but I was curious if anyone had dimensions for the actual hole in the hull.

more later...

[nauticalnovice]

OK, I think I found out what these are.

The seacock/thru-hull combination is called a "Martwell Shakewell Plastic Seacock"

I don't think these are made any more and I could only find "serviceable" versions still for sale:

Shakewell valve or Shakewell-Seacock: Through-hull valve for sail and motor

Generally it seems like the entire valve assembly cost about $100 per, but it's not at all clear to me how these are mounted in the boat. It seems like they're glassed in or something. I can't find any bolts running through the hull to keep them in place or wood blocks on which seacocks are usually installed.

https://www.arnoldsboatshop.com.au/shop/valves-plunger

https://www.theboatwarehouse.com.au/...acock-plastic/

I think I'm going to remove the plunger on one of these to see if I can find materials to rebuild them.