No Fuss Flush vacuum breaker check valve needed?

[Old_Stevenick]

I just installed the No Fuss Flush spray head and attached it directly to a 3' metal hose. I can now just attach anything to that.

When I got the instructions it says to put plumbing going up from it, probably under the sink, into a breaker check valve and back.

Is this necessary? What is the problem with just feeding the the directly?

I will keep the dump valve open while I flush.

[chuckster57]

By law you must have a back flow prevention device. It eliminates the possibility of contaminating the municipal fresh water supply with waste water “stuff”.

[JRTJH]

If your flush sprayer is "plumbed horizontally to the hose connection, as the tank fills with waste products, once the fluid level rises above the holes in the spray nozzle, it'll start leaking down that metal pipe and to the connector where you attach the garden hose to use the sprayer. If that connector has a "screwed on cap", when you remove the cap, you're likely to get a 'brown welcome". It'll probably only be a few drops, but enough that your hands will know it's there.... Attach the hose to that and the hose is then also contaminated.

The reason for the "anti-siphon valve and the "rise in plumbing to prevent leakage" is to protect the public water system from being contaminated.

You can buy an anti-siphon valve that screws onto the garden hose fitting on your pipe, but whether it's going to prevent all potential for contamination of your garden hose ????? A lot depends on how you "self installed your system".

[Old_Stevenick]

This all falls into the "I'm glad I asked" category.

I am considering using one of these

Backflow preventer.

My self install has the No Fuss Flush mounted on the upper side of the blackwater tank with a 3' metal garden hose running to the side of the TT. I am putting a cap on that.

[JRTJH]

Originally Posted by Old_Stevenick

This all falls into the "I'm glad I asked" category.

I am considering using one of these

Backflow preventer.

My self install has the No Fuss Flush mounted on the upper side of the blackwater tank with a 3' metal garden hose running to the side of the TT. I am putting a cap on that.

If it were me, I'd put that backflow preventer on the end of the metal garden hose where I could see it and "know it's there and working" every time I touch the hose connection. I'd also wear rubber gloves when handling the cap covering that backflow preventer, just in case it might "malfunction" when I least expect it..... The objective is to prevent black tank contents from getting "out through the flush nozzle/plumbing"... If you're doing that, you should be OK as long as it works properly.

Good news (if you can call it that) in 50+ years of trailering, I've never had any inspector check for a backflow preventer on any of my trailers. So, it's pretty much an "honor system that you keep the rest of us from being contaminated if we use that campsite after you leave".....

[Old_Stevenick]

I contacted Valterra (the manufacturer) and they said that that type of device would "definitely help."

I certainly do wear gloves when I dump. I don't stay in full hookup sites, so this will all be with the dump station water feed, already something that I would think is not exactly considered clean.

[Old_Stevenick]

Originally Posted by JRTJH

If it were me, I'd put that backflow preventer on the end of the metal garden hose where I could see it and "know it's there and working" every time I touch the hose connection.

I was planning on putting it right where the No Fuss Flush enters the tank, but based on your advice will put it at the inlet end.