I need an additional seawater intake for my merc 350 mag/bravo3. I am checking out the Forespar Marelon 1 1/2" flanged seacock then to a seawater stainer and reduce to a 1 1/4" hose to my seawater pump Y.I can't find a "scoop" strainer thru hull from Forespar to screw into the 1 1/2" seacock, just a mushroom thruhull to thread into the seacock. Will I get enough flow on step without the scoop and is Marelon ok for engine compartment area? Does a seacock have to have flanges to bolt thru to be safe or can you use a ball valve and thru hull with backing plate which is what my head looks like it has?
Seacock for engine seawater pickup
- Thread starter AKClydo
- Start date
- Joined
- Mar 5, 2001
- RO Number
- 3655
- Messages
- 1,800
I don't like plastic or nylon below the waterline. My suggestion would be either stainless steel or bronze, see following link:
http://www.boatfix.com/catalog/635.pdf
The Perko with the scoop strainer (facing forward) would likely be best.
As far as to whether or not you'll get enough water, I really can't say - it depends on the configuration of the hull and if the water rushing by creates a vacuum at the through-hull.
http://www.boatfix.com/catalog/635.pdf
The Perko with the scoop strainer (facing forward) would likely be best.
As far as to whether or not you'll get enough water, I really can't say - it depends on the configuration of the hull and if the water rushing by creates a vacuum at the through-hull.
- Joined
- Sep 16, 2003
- RO Number
- 12212
- Messages
- 12,183
i agree... i woudln't use anythign but bronze under the water line even though in all fairness marelon is a good plastic and acceptable.
and make sure you only use bronze, do not use any brass fittings as they will corrode much faster and may sink the boat !
and make sure you only use bronze, do not use any brass fittings as they will corrode much faster and may sink the boat !
Finally finished the extra intake project. The flange on the seacock seems to be a more stable system. I used the bronze seacock and strainer in 1 1/4" but may have gone to 1 1/2" or 1 1/4" full flow if I had known what was up with the different ID. The epoxied backing plate really helps reinforce the seacock. I clothed over the plate and epoxied the bronze flange bolts into the plate. Used 5200 sealant to seal the scoop thru hull. Thanks for the feed back. tight lines, Clydo