Raw Water Intake/Seacock Install Tips/Advice?

[NorCal_Skipjack20]

Have never attempted a job like this so am looking for advice/guidance so as to do the job right yet cost effectively.

Want to be install a 1" Raw Water Intake/Thru-Hull with a External Hull-Mount Strainer and 1" Seacock with a G10/FR4 Backing Plate. Boat is a Skipjack 20 Open with 350 motor that is trailer launched and hardly ever slipped for more than a day or two at a time. Bottom thickness of hull is at least 3/8 to 1/2 inch, possibly thicker as Skipjack built these boats strong.

Parts being considered

Groco TH-1000 Bronze Thru-Hull

Groco APHS-1250-1 Bronze Hull-Mount Strainer

G10/FR4 Backing Plate 5" x 5" x 5/8"

Groco IBVF-1000 1" Bronze Flanged Mounting Base

Groco IBV-1000 1" Bronze Ball Valve

The reason for considering the IBVF-1000/IBV-1000 mounting base/ball valve combo is it's $107 less than a Groco BV-1000 Bronze Seacock. The IBV-1000 ball valve has a chrome-plated brass ball and is not serviceable vs a SS ball and serviceable aspect for the BV-1000 Seacock.

On the issue of a backing plate for the seacock assembly - I was considering the G10/FR4 material as I can get a scrap of it for a reasonable price. My question is would 3M 4200 FC be acceptable to bond the G10 down to the fiberglass in my bilge or should I use 3M 5200 or use a good two-part epoxy? Do I even need a backing plate if my hull thickness is 1/2" or thicker?

Also, I came across an alternative way of mounting the seacock/backing plate without drilling three additional 5/16 holes in the bottom of my boat. The method is shown in detail in the following link - does this seem ok or should I just drill and through-bolt? Seacock Backing Plates / Alternate Method / No Through Bolts Photo Gallery by Compass Marine at pbase.com

 

[Yacht Dr.]

Re: Raw Water Intake/Seacock Install Tips/Advice?

Wow .. some serious overkill here .. NASA grade G10 .. $100 fittings ..

What are you planning on doing with this Raw water intake ?

Would a simple scoop like this Groco Bronze Thru-Hull Scoop Strainers work for you instead ? Put your sea **** on that and bingo bango ?

Unless your looking for something Very serious.

You suggested a "job right yet cost effectively" .. but your post has some of the most costly items ..

BTW .. that link for your alt has some serious problems with it. Anyone who posts a blog about through hulls and shows his Grinding profile ( Sand The Hull photo - Compass Marine photos at pbase.com ) for a simple through hull can be taken with a grain of salt.

YD.

 

[NorCal_Skipjack20]

Re: Raw Water Intake/Seacock Install Tips/Advice?

The reason for the Groco APHS-1250-1 external strainer is to prevent Eel Grass which is common in my area, Monofilament Fishing Line, etc. from getting sucked in and possibly fouling the impeller on my Raw Water pump. The scoop strainer you suggest could potentially pass stuff like that through. I don't have room in my bilge area for an Internal Basket-Type Strainer plus they cost twice as much.