[Jim/Chris]

It appears to be a direct acting valve you have. A DAC has a spring loaded disc that rises under pressure only if the water has enough pressure to overcome the spring pressure. My vote is no in the way of you being able to adjust your water pressure for your new pump. My thoughts are that if it was installed from the factory backward; the only way I can see water passing through is the spring was backed off enough to let water pass backward.

I just have to ask why there is a pressure regulator beyond your water pump. I can see one needed for a city water hookup but the factory put it too far down the line if your pump has to fight it too. I think it could be removed all together and either relocated or placed to use when bypassing the pump.

With that, I don’t know that I have been able to identify every water line in the picture. Does the regulator supply the whole coach with water or only a faucet(s)? What is the red valve that is closed? And the biggest question I have is that a check valve underneath the the regualtor? If so, it appears to be facing downward too? If Im looking at the check valve correctly, is the regulator really backward? The coach would have no water if the check valve is working properly.

[Archived]

Patrick, I feel a little stupid now, but after I did a little more looking at the whole thing, I figured it out. The regulator is installed correctly, the line out of the top of the regulator is actually the fresh water line from the opposite side of the coach, where you hook up city water. So the check valve below the regulator keeps water pressure from the water pump from crossing over the the city hook up. The closed valve has been added by the previous owner, and I believe was maybe for a pressure washer installation, if I have the pump on and open the red valve I get a lot of water out from under the engine area, I will check that out later. I just never have that side of the water bay open that often, and it took a minute to sort everything out.

[Harry]

Mark,

My Marathon H has a hose hookup from the factory in the curb side plumbing bay for the purpose of attaching a hose for washing, etc. It’s controlled by the yellow ball valve and maybe your previous owner tied into that line.

[Archived]

Hey Mark I understand. Of course I do not know exactly how Marathon plumbs their system b/c Ive never had one but I bet I sat there looking at your picture for a half hour trying to think of where the water was coming from going into the regulator! I swear the picture was upside down when you posted it the first time but I didnt catch on to that until I looked at it the other way. What you discovered makes sense now.

[doris]

Tom I think that I might have that same valve, I will look tomorrow. Thanks for let me know.