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Old 08-17-2015, 06:29 AM   #1
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Mainship Fresh Water Pressure

When I hook up my dockside water hose to supply my 2002 390 Mainship with fresh water the pressure is significantly less than using the onboard tanks. Water pressure from the dock is great. Documentation I have on the boat says that there is a pressure regulator in the dockside supply line to regulate dockside water pressure. Does anyone know where this regulator is located?

Thanks
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Old 08-17-2015, 06:46 AM   #2
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Common sense would suggest that the pressure reducer would be located very near (within a foot or two) of your connection point. It may look like a small bell shaped bronze device. The PRV is used to protect the internal fresh water piping and fixtures from excessive pressure and potential harm so therefore it should be located near the connection point or it would not be protecting as much internal piping.
Be aware that this may re-spark the debate as to whether using the dockside water as normal supply while at dock is a safe practice.

Good luck
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Old 08-17-2015, 07:23 AM   #3
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Quote:
Originally Posted by ulysses View Post
Common sense would suggest that the pressure reducer would be located very near (within a foot or two) of your connection point. It may look like a small bell shaped bronze device. The PRV is used to protect the internal fresh water piping and fixtures from excessive pressure and potential harm so therefore it should be located near the connection point or it would not be protecting as much internal piping.
Be aware that this may re-spark the debate as to whether using the dockside water as normal supply while at dock is a safe practice.

Good luck
Our MS 350 is the same, I replaced the inlet/regulator and it made no difference. We just use the tanks, 130 gallons lasts us one week and we are live aboards.
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Old 08-17-2015, 07:32 AM   #4
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Bob, Mainship during that period may have been using the same systems as Silverton (sister company, at the time) so check to see if your dock water inlet is a Jabsco. If so, search pics of model 44410. If it looks the same, it's a 35 psi regulator incorporated as part of the inlet assembly.

If that's what it is... a more current Jabsco inlet/regulator is their model 44411-series, 45 psi, better. Unfortunately, not the same mounting footprint; slightly larger... but in our case that wasn't insurmountable. There are two versions, one with an L-shaped NPT connection on the back (44411), the other with a straight Snap-In (QEST) port fitting on the back (44412, oddly, not clearly listed on the Jabsco/Xylem site last I checked recently).


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