Good Sam Club Open Roads Forum: By passed Black Tank Flush back flow preventer
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Open Roads Forum  >  Do It Yourself Modifications and Upgrades (DIY)

 > By passed Black Tank Flush back flow preventer

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Atlee

Mechanicsville, VA

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Posted: 02/22/18 03:33am Link  |  Quote  |  Print  |  Notify Moderator

The back flow preventer failed after 5 months of use. Was going to replace it yesterday, but @ $50, I decided no. Looked for a simple plastic elbow, but couldn't find one, so made a brass one. Also used a couple of strap hangers to help secure the flush tubing. Something that should have been done at the factory, IMO.

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The broken piece is on the left. $50 The two brass pieces used to replace it are on the right. $13.15

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I added strap hangers to help keep the top heavy long run of plastic pipe in one place.


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Posted: 02/22/18 04:54am Link  |  Quote  |  Print  |  Notify Moderator

It doesn't have to cost $50 for the cheap plastic one ..go to Lowes Under $19 for a brass one, of course you'll need two 1/2" nipples. The system should function as designed without the horrible adverse effect inside your fresh water system.


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JaxDad

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Posted: 02/22/18 06:04am Link  |  Quote  |  Print  |  Notify Moderator

You couldn’t pay me enough to remove a backflow preventer in a spot like that.

It’s illegal for a reason, because it’s potentially a deadly accident waiting to happen.

How much liability are you willing to assume for omitting a $20 part?

agesilaus

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Posted: 02/22/18 06:05am Link  |  Quote  |  Print  |  Notify Moderator

When you all come down with gastroenteritis (or worse) you'll spend more than $50 not counting your lost time. That backflow preventer is not there for cosmetic reasons.


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rhagfo

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Posted: 02/22/18 06:17am Link  |  Quote  |  Print  |  Notify Moderator

I would never use that without that back flow device!!!


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Cummins12V98

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Posted: 02/22/18 06:40am Link  |  Quote  |  Print  |  Notify Moderator

So you are willing to risk SERIOUSLY contaminating the RV parks water system??? These parks have lines break all the time and guess what that creates a pull on your water line potentially sucking SH!T into the parks water system.

Since you now know the serious risk YOU have created are YOU going to step up and replace your vacuum breaker with a new functioning unit????????


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newlee

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Posted: 02/22/18 07:16am Link  |  Quote  |  Print  |  Notify Moderator

It is really hard to fix stupid.


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CarnationSailor

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Posted: 02/22/18 08:07am Link  |  Quote  |  Print  |  Notify Moderator

I think the risk of not having a backflow preventer is being overstated.

A couple of years ago I had a question about my black tank flush system and called the company that made it. The owner and designer of the system happened to answer the phone (small company). Among other questions, I happened to ask him about all the failures I was reading about on this forum. He said his model had very few failures, but if mine failed, I should call and he would send me a replacement for free.

He also said that he believed a backflow preventer was completely unnecessary as long as the supply line rose at least 2-feet above the tank before dropping back down to the hose connection. He said there was no way a siphon could form with 2-feet of air above the tank. If mine should fail, he recommended that I just bypass it. (He included a backflow preventer in the kit because RV manufacturers wouldn't buy it otherwise.)

You can take this for whatever you think it's worth, but at least try not to beat up the OP so hard.


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Matt_Colie

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Posted: 02/22/18 08:08am Link  |  Quote  |  Print  |  Notify Moderator

We don't know how far the OP's lash-up is above the waste tank.

What he obviously does not know is that a real backflow preventer is more than just a check valve. When pressure is not present in the inlet or is at the outlet (either case) the device opens a 2" air gap between the supply and the service.

But it will be safe for the community as long as he never attaches the system to the water supply and/or overfills the black tank.

Matt

* This post was edited 02/22/18 08:25am by Matt_Colie *


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ScottG

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Posted: 02/22/18 09:03am Link  |  Quote  |  Print  |  Notify Moderator

This is probably the worst idea I have ever read about on this forum (and that's saying something).


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