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Saturday, January 14, 2012

Plumbing and PEX

Before the forward salon settees are permanently installed, I need to give thought to the hose runs for the domestic plumbing system. For ease and flexibility of installation we have chosen PEX tubing for the hose runs. This stuff is commonly used in RVs and household radiant floor systems. The tubing is a tough polyethylene material that fits a variety of "friction" fittings for valves, elbows, couplings, reducers, etc. No barbs or hose clamps. There are many manufacturers of these fittings made from materials like polymer plastics and brass. Name brands include Watts, SharkBite, SeaTech.
250 feet of pex tubing
The galley and both heads will have hot, cold and raw water (seawater) service.  There will be pressurized raw water service to the bow and stern for deck mounted washdown fittings (perhaps cold fresh water too).
Plan view of plumbing runs.
Details to come.


She:Kon said...

Have you picked up a distribution manifold for the pex tubing yet? I got mine on for dirt cheap.

Go to and do a search on this item number 120842367400

robert s said...

SK, thanks for the tip. I haven't yet worked out exactly which fittings I need. There is still some design to be "finalized". For now I am just dealing with the hose runs.

Anonymous said...

Is it possible to insulate the hot water feed with a foam wrap. Pex is terrible for radiating away the heat.

robert s said...

Hmm. Dunno about insulating PEX. I suppose I could use water heater hose instead. Most likely the hot water will only be turned on when needed (cooking, showers, etc.) so the heat loss may not be much concern.

Anonymous said...

I suppose the condensation on the cold side could be eliminated at the same time. Colin

robert s said...

Another possibility. Heat loss from the PEX tubing would encourage air circulation due to convection. Air circulation is always good, especially in the areas where the PEX tubing is being run (lower ends of enclosed cabinetry). How is that for a rationalization! LOL.