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Old 10-06-2015, 03:30 PM   #11
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Just had the same thing happen to my '16 Columbus. Only behind the shower faucets. Just not tightened at factory.
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Old 10-06-2015, 06:21 PM   #12
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I got the camper home today and tried again. I thought I might have goofed as the first time I tried using the tank flush the black tank was 2/3rds full and the camper was parked on an incline so the nose was about 8 to 10 inches higher than the rear. I thought that I might have covered the sprayer with water and that's why I didn't see anything happening through the toilet.

When I tried it today I did it on an empty black tank. Nothing - I shut the water off and when I unscrewed the hose from the fitting on the side of the camper I got air pressure coming back out of the connection. This leads me to believe something in there - the valve? - is blocking the mechanism.
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Old 10-06-2015, 06:38 PM   #13
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I. went with a back flow protector, 3/4" brass that has 2 back flow flaps inside, made to be used in a house.Don't need vacumn break as tank is vented thru roof. Also, when the plastic unit fails, you'll have water everywhere and if the vac. part fails, it'll stink up the joint. The valve I got was just at $30.00....worth it to me. Check the valve for correct flow direction..,.water should inter from bottom and exit the side....in the side outlet there is a spring loaded check valve that water pressure opens, allowing water out the side connection...if hooked up backward, no flow. Also, the little rectangular top piece is removable to look inside.
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Old 10-07-2015, 09:24 AM   #14
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Yes you need a back flow preventer!

It doesn't happen often, but if someone opened a fire hydrant or broke a main while you were cleaning your blackwater tank, the huge flow out of the hydrant or break would cause a vacuum on your hose and suck black water into the fresh water system. Black water contains e-coli bacteria, which can be fatal.
That is why backflow prevention is required by code and regulation. Would you take the risk to save $30. I wouldn't. I'm thinking a wand on the end of a hose would do a better job of cleaning the tank anyway.
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Old 10-07-2015, 09:29 AM   #15
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Quote:
Originally Posted by bob caldwell View Post
I. went with a back flow protector, 3/4" brass that has 2 back flow flaps inside, made to be used in a house.Don't need vacumn break as tank is vented thru roof. Also, when the plastic unit fails, you'll have water everywhere and if the vac. part fails, it'll stink up the joint. The valve I got was just at $30.00....worth it to me. Check the valve for correct flow direction..,.water should inter from bottom and exit the side....in the side outlet there is a spring loaded check valve that water pressure opens, allowing water out the side connection...if hooked up backward, no flow. Also, the little rectangular top piece is removable to look inside.
Bob, could you post a link or image of the back flow protector you got?

Thanks
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Old 10-07-2015, 09:33 AM   #16
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A very popular and not so expensive dual check backflow preventer is the Watts No.7.

Bruce
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Old 10-07-2015, 10:10 AM   #17
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That be it!
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Old 10-07-2015, 10:16 AM   #18
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Quote:
Originally Posted by mnoland30 View Post
It doesn't happen often, but if someone opened a fire hydrant or broke a main while you were cleaning your blackwater tank, the huge flow out of the hydrant or break would cause a vacuum on your hose and suck black water into the fresh water system. Black water contains e-coli bacteria, which can be fatal.
That is why backflow prevention is required by code and regulation. Would you take the risk to save $30. I wouldn't. I'm thinking a wand on the end of a hose would do a better job of cleaning the tank anyway.
Tanks are vented...can't create vacumn.
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Old 10-07-2015, 10:27 AM   #19
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I just checked, the L7 is listed as "obsolete" on the Watts website. That's the bad news...the good news is it looks like they've replaced it with the LF7 (lead free)
LF7 Lead Free* Bronze Dual Check Valves, Dual Checks / Dual Checks with Atmospheric Vent, Backflow Prevention - Watts

Description:
Series LF7 Lead Free* Dual Check Valves prevent the reverse flow of polluted water from entering into the drinking water supply at the service entrance or at individual outlets. It consists of a Lead Free* cast copper silicon alloy body construction, with two plastic replaceable check valves, and stainless steel springs. Series LF7 is designed for non-health hazard residential water system containment, continuous pressure applications. It is installed immediately downstream of the residential water meter, in a vertical or horizontal position. Check with local inspection authorities for installation requirements. Minimum Working Pressure: 10psi (69 kPa) Maximum Working Pressure: 150psi (10 bar).

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Old 10-07-2015, 10:33 AM   #20
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Two hose nipples and clamps also needed
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