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Old 10-02-2024, 08:41 PM   #1
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Is the water inlet fixture a pressure regulator and other questions...

Questions for my fellow Dolphin owners that have come recently...

1) Is the water inlet fixture also a water pressure regulator? (see attached pic). I have an inline regulator as shown in the pic already - but if the fixture is actually a regulator already - then the redundancy seems unnecessary. PLUS - I actually seem to get better pressure from my onboard pump than from the regulated city service.

2) The roof vents for the holding tanks... my grey water tank is topped with a Camco cyclone cover. I was up there attempting to remove the cover to see if some insect had made it's home in there. Pulling up on the cyclone - it pulled up a section of black sewer pipe it was attached to. The black pipe would not come completely out as the cyclone is a 2-part cover with a tapered or domed flange and the black pipe apparently had a fitting on it that would not allow it to come up through the flange. My question is... is that the way it is suppose to be? a multi-part pipe that comes up from the tank through the roof? And if it is a multi-part pipe - what is at the other end of the pipe I couldn't pull up?

My ultimate goal was to flush some water through the vent pipe back into the holding tank to make sure it is clear. After I found this top part coming out - I abandoned that plan until I can know for sure.

Any direction or knowledge in these 2 issues would be welcomed!
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Old 10-02-2024, 09:00 PM   #2
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It appears that you have what they call a "pressure regulator" in the input, just below the 90 degree elbow (just below where your arrow is pointing).
These "regulators" like this
really don't work very well and mostly just limit flow rather than pressure.
I strongly suggest a real pressure regulator like this


available through Amazon and just about any RV outlet, that does actually regulate the pressure and protect your RV's plumbing from over-pressure that you may encounter at some camping sites.


I have never heard of an extendable tank vent pipe. I'm guessing you may have pulled the pipe out from a connection, possibly clamped, somewhere between the roof and the tank
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Old 10-02-2024, 09:17 PM   #3
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"It appears that you have what they call a "pressure regulator" in the input, just below the 90 degree elbow (just below where your arrow is pointing)."


I updated my post - I had neglected to state that I had the inline regulator because I wasn't aware that the inlet was/might be a regulator as well.
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Old 10-02-2024, 09:25 PM   #4
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OK. In that case, I don't believe I have ever heard of a coach with a built-in pressure regulator. This is likely do to the fact that regulators have a limited lifespan, due to corrosion and buildup of hard water deposits, and no RV manufacturer wanted that where you couldn't get to it to replace.


Your safest bet is to assume no, and get a regulator.
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Old 10-02-2024, 10:56 PM   #5
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I would bet that you do have a regulater built in because I have one in mine. I tried using one in line outside and with two in line it cuts volume so much it is almost unusable. The one that is built is still working well.
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Old 10-08-2024, 11:04 PM   #6
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Have you asked this before?

We have a TropiCal, not a Dolphin, but the water inlet looks identical and it is a pressure regulator. Quite common.
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Old 10-09-2024, 12:20 PM   #7
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This probaly a check valve at the city connection. It prevents water from squirting out while using the pump and not connected to city water. That's what our Seabreeze has. As far as the vent pipe, sounds like you pulled it loose at a joint. Not good.
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Old 10-15-2024, 11:21 AM   #8
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Quote:
Originally Posted by smithbill View Post
"It appears that you have what they call a "pressure regulator" in the input, just below the 90 degree elbow (just below where your arrow is pointing)."


I updated my post - I had neglected to state that I had the inline regulator because I wasn't aware that the inlet was/might be a regulator as well.
This is what is built-into the coach inlet. Yes, it has the regulator built in, and adding an additional regulator will restrict flow.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I ran mine with two regulators for a couple of years, as I didn't realize that the inlet regulator was built-in, and I always wondered why I had no water pressure. There were a couple of times where having two regulators created problems and I couldn't get the water tank to fill. No problems since I removed the external regulator.
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Old 01-12-2025, 03:06 PM   #9
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I have added a cyclone to my sea breeze. When I went to install it on the roof vent there was not enough vent pipe sticking out above the roof. I installed a reducer and smaller sized pipe onto the cyclone then slid the smaller pipe into the existing vent pipe. I,ll bet someone before you did the same.
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