Black tank flush system - use of pressure regulator

AZ T&T wrote:

therink wrote:
I wouldn't and don't use one when flushing tank. My tank needs all the help it can get

x2

X3

I always install a "Y" in front of the regulator to accommodate the flush hose when I'm ready.

Paul Clancy wrote:
The anti Siphon in my last trailer was connected with Pex so the regulator is probably a good idea.

It does not matter because the flush always let's out water so it can't explode.

I have run 80 psi with no ill effects this last winter at a park in Indio for 5 months with no regulator. I would have normally installed the regulator at 60psi or more but forgot about checking the pressure when setting up. Someone asked if I had a regulator they could try so I hooked up my pressure gauge and noticed the 80psi! Oh well no harm. This was a couple days before I left the park.

45Ricochet wrote:
Great question, I have always used the pressure regulator at all times but that
nipple on the flush system is a standard 5/8 hose. I am assuming here but that would suggest it doesn't have the typical small pex lines. I've never had a problem with it not working correctly but I'm sure the higher pressure would do a better job. Thanks for the great question but I'm not sure I'm going to be taking it off every time I need to rinse it out.

I always screw on a manifold to the park water spigot and use a regulator if the pressure is over 60psi on the hose supplying the RV. I have my regular hose connected to the manifold with out a regulator for general use. I use that hose to connect to the flush so I am not turning off the water to the RV. No regulator on the regular hose means more flow when washing the TV or RV and the flush system.

Works for me.

I use a "Y" at the hose bib, before the regulator.Hook the flush hose to "Y".Full pressure to the black tank cleaning system.As others have pointed out pressure will not build up in that line,so no need to regulate it.
No problems in 7 years full time.

The anti Siphon in my last trailer was connected with Pex so the regulator is probably a good idea.

Chuck&Gail wrote:
I use a regulator. It is my understanding that the fittings for the antisiphion valve and etc are same as rest of RV plumbing, which I believe is rated at 50 psi. I have personally seen over 100 psi at some campgrounds.

x2 - I have personally seen 150 lbs.

Great question, I have always used the pressure regulator at all times but that
nipple on the flush system is a standard 5/8 hose. I am assuming here but that would suggest it doesn't have the typical small pex lines. I've never had a problem with it not working correctly but I'm sure the higher pressure would do a better job. Thanks for the great question but I'm not sure I'm going to be taking it off every time I need to rinse it out.

wrvond wrote:
Since the built in flushing device requires the drain valve to be open, there's no need to regulate the water pressure going in. Further, I keep all my potable water components, such as hoses, regulators, filters, etc., far away from my black water tank components.
Just sayin'...

I don't use a pressure regulator since you want as much pressure as possible to clean the tank.

I don't think "requires" is the correct word.

I drain the black tank then I close my black valve for 5 minutes while flushing then open and let it flush for 5 minutes then close and fill for one minute then add chemicals.

I set the timer on my phone so I don't forget and have a fountain coming out the top of my RV.

I have never used a regulator on the tank flush system. As said above, no pressure build up. Also, I keep a grey hose for the flush system. Been doing it this way for seven years.

Since the flush system is always open at the sprayer, it can't build pressure. Since it can't build pressure, no need for the regulator.