[Public-List] Recommendations for replacement seacocks and thruhulls

Tue Jun 18 07:32:54 PDT 2024

When I replaced all of mine, I used the Groco FBV series flanged seacocks. These come with grease fittings. First, I made round backing pads made of G-10 which were epoxied to the hull. After the thru hulls and valves were dry fitted, holes were made through the hull to secure the flange.  I used bronze flat head machine screws with nuts and washers. The heads were countersunk into the hull. Afterwards, everything was disassembled, cleaned, 3M 4200 sealant applied and all the components secured to the hull. 

On Jun 17, 2024, at 7:52 PM, Greg Hounsell via Public-List <public-list at lists.alberg30.org> wrote:
If I may toss in my 2 cents. If thinking "plastic" the only safe option is
Marelon. Regular plastic is far too brittle in the long run. Be aware with
Marelon fittings, they are all straight thread so if you choose their
seacocks ( or ball valves), then stick with their fittings for that
assembly.

It costs more but I think going with proper seacocks is safer and stronger.
When you turn the stiff handle, the flange on the base of the seacock
against the hull takes the torsional stress. With a ball valve, that stress
is relayed straight down into the thruhull fitting, the nut and the
caulking. Sure they have lasted for years,  but why chance it? The original
Gate valves lasted for years but we all get rid of those asap...

Greg
592

On Mon, Jun 17, 2024, 7:30 a.m. Glenn via Public-List <
public-list at lists.alberg30.org> wrote:

You will need two components: a thru hull, and a ball valve. The thru hull
fitting clamps to the hull. The ball valve shuts off the flow of water into
the boat, as needed. Any brand will do.  Bronze is the traditional
material, although plastic parts are quite common now days as well. Stay
away from stainless steel in this particular application.  Stainless is
susceptible to galvanic corrosion if mated to a bronze fitting.

THe most critical bit is to source the correct diameter for each rubber
hose.

Most any on line or walk up marine parts chandelry will have these readily
available.

Sent from my iPad

On Jun 16, 2024, at 7:00 PM, Wade Wall via Public-List <

public-list at lists.alberg30.org> wrote:

Hi all,

I need to replace several of my thruhulls, but am very confused as to

what

parts I need and what brand I should buy. I need to replace the cockpit
drains, the freshwater intake for the engine, and the galley thruhulls.

Can

someone tell me, preferably with part numbers, what exactly I need? I

know

this is a big ask, but even with my reading about it, I'm still confused
and I don't want to buy a bunch of parts that I don't actually need.

Thanks for any help you can provide.

Sincerely,

Wade Wall
#421
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