What is this?

Ryeandwater · #1 04-22-2022

Sadly the plumbing on my FC was not properly winterized at some point and I have a few split pipes. While checking plumbing, I found this under the bathroom sink. Pretty sure it is on the cold water supply.
What the heck is it?

Dave Stokes · #2 04-22-2022

Kinda looks like a water pressure sensor. A water flow sensor wouldn't be as cobbled together. However, I really have no idea.

susanmarycamilleri · #3 04-22-2022

It is a pressure switch. The water pump that they used to install was a piston water pump. That pressure switch would cut power to the water pump when the desired pressure was reached. Most new rv water pumps have a built in pressure switch, so that switch becomes redundant.

CarneyRacing · #4 04-22-2022

Quote:

Originally Posted by Ryeandwater

Sadly the plumbing on my FC was not properly winterized at some point and I have a few split pipes. While checking plumbing, I found this under the bathroom sink. Pretty sure it is on the cold water supply.
What the heck is it?

This is the pressure switch that runs the house water pump. If you still have the original pump, it doesn't have a pressure switch on it. If your pump has been replaced with a different pump, this switch may or may not still be used.

Ryeandwater · #5 04-22-2022

Thanks everyone.
Pretty sure it still has the original water pump. It ran when I turned it on momentarily, but no idea if it works.
I am testing for leaks using compressed air, I have found a few.
Is there a pressure regulator built in?
I looked at the plumbing schematics, and is says there is, but I haven’t found it.

Thanks again.

Ryeandwater · #6 05-03-2022

Discovered lots of leaks.
Running pex from back to front. Hoping the copper behind the shower is okay, because I have no idea how to get at it.
With all the drains for winterizing, it’s too bad they were not used.

tulipvendor50 · #7 05-03-2022

Jim, I replaced all the copper piping in my 84 with pex. Behind the shower I thought was going to be difficult but it was actually very simple. I removed the shower valve cover, removed the pipes and fed in new pex pipes, it was easier typing it than doing it though LOL.

isp2952 · #8 05-03-2022

Quote:

Originally Posted by Ryeandwater

Discovered lots of leaks.
Running pex from back to front. Hoping the copper behind the shower is okay, because I have no idea how to get at it.
With all the drains for winterizing, it’s too bad they were not used.

Yeah, that stuff is a mess. It is good you found it to be an issue. Pex does work very well. If you can't take out the old just run new pex and abandon the old stuff. I know a lot of guys have questioned the push-lock fittings for pex but I have used them in my home and not had one issue with anything in 12 years. So buying the expensive tools needed for the other types of installations is crazy. There are some quality push-lock fittings out there and make the job not only more reasonable but so much easier. Some places you have to get to don't allow for some of the tools to get into either, so you may be forced into the push-lock fittings in those tight places, so why not do all of them that way?

Ryeandwater · #9 05-03-2022

Yep, the copper I couldn’t get out was just left in place. It was tricky shoving two runs of pex blindly behind the wall,but with a fish tape and string I got it.
I have the tools for the fittings, but also use the push type where access is limited.
Is the small accumulator tank necessary after the pump? Just another potential leak in my mind.

isp2952 · #10 05-03-2022

Quote:

Originally Posted by Ryeandwater

Yep, the copper I couldn’t get out was just left in place. It was tricky shoving two runs of pex blindly behind the wall,but with a fish tape and string I got it.
I have the tools for the fittings, but also use the push type where access is limited.
Is the small accumulator tank necessary after the pump? Just another potential leak in my mind.

A lot of buses have them and a lot don't. I have had a '93 and a '00 and neither one had a pressure tank. I think it is relevant to how large of a pump you have and if you have two or just one. I have two on both of the buses I have had. My guess it may be advantageous on the older models that may only have one pump and maybe those were not up to the task of the newer pumps these days. Don't count me as an expert but just an observer and this was what I have come to determine based on what I have seen and heard.