Galvanic corrosion on isolated brass fixtures

[b_arrington]

The entire manifold and fittings are plastic so install a plastic shut off valve in each line and you're done. I used to over think this stuff but it really isn't a big deal to go plastic where plastic already is. The thru hull shut off valve should be brass or bronze for sure.

That was my inclination. IIRC the seacock for the AC water intake is made from marelon. My other ones are bronze.

 

[Spark600]

Pics would be great!

Sprinkler fittings - interesting. I have a (typically) well-stocked sprinkler supply house in my town. I could stop over there and see what they have. My local Ace hardware is quite limited.

Here are the pictures.
The T and all the hoses are the way Sea Ray built the boat, I just cut the tees into the hoses.

 

[brewster16]

Here are the pictures.
The T and all the hoses are the way Sea Ray built the boat, I just cut the tees into the hoses.

Got it!....Thank you

 

[brewster16]

I had an experience where one of my AC units had sediment that clogged the line. Since it was an open circuit with 2 other units, I couldn't get enough pressure to clear the line. I was concerned that would be a problem when winterizing - not enough pressure to get the pink all the way through.

Having a shut off would help ensure that the pink flows to each unit.

Also, if you use a Sea Flush their instructions for multiple units are to clamp the other hoses shut. That doesn't seem to work with my hoses as they are a little too rigid. It would be needed because I have 2 units higher than the third; I would ever get the pink "up hill" because it would run out the lowest hose.

Makes sense..thanks Brad

 

[b_arrington]

McMaster Carr delivered some bits today. 3/4 threaded to 5/8 barbed fittings, and some nice rolled edge band clamps.



Fits perfectly into the Home Depot ball valve. The barbs are shorter than I would like but I should be able to double clamp them.

I know an elbow reduced efficiency but will make the installation easier. A single elbow per line should be OK.

 

[ttmott]

McMaster Carr delivered some bits today. 3/4 threaded to 5/8 barbed fittings, and some nice rolled edge band clamps.

View attachment 114520 View attachment 114521

Fits perfectly into the Home Depot ball valve. The barbs are shorter than I would like but I should be able to double clamp them.

I know an elbow reduced efficiency but will make the installation easier. A single elbow per line should be OK.

Why double clamps?

 

[b_arrington]

Why double clamps?

Double clamps are a best practice for any raw water fitting. Since these are one the AC raw water cooling line, it applies. If one failed while the AC pump was on it would be continuously flooding the boat.

I know a Sabre owner that had an AC hose fitting fail and it did exactly that. Only reason it stopped was the water spray shorted out the panel foe the AC pump.

The extra clamp costs about a buck, so cheap insurance.