Plumbing leak help

dougrainer wrote:


OK, WHERE should it be installed?????? Doug

I reinstalled mine by hanging it on the barn wall, never seen a drip after that.

I'm sure that a manufacturer could hang it in a large pipe that drains outside, in an outdoor shower, or any number of other possibilities, but that would cost minutes and a few bucks. It ain't rocket science.

dougrainer wrote:
OK, WHERE should it be installed?????? Doug

Instructions no doubt crafted under guidelines provided by legal counsel...

Lynnmor wrote:

dougrainer wrote:
The purpose of this check valve is to keep from siphoning black water out of the tank. It is mounted HIGHER than the tank system. 99% of these valves are located in the Bath Lavy sink area. They leak from a few things. BUT THEY ARE NOT SUPPOSED TO LEAK AT ALL. The plastic Check valves do not like high water pressure, especially if you open the fresh water spigot full force. Always start out with a slow opening of your fresh water spigot, then increase to full force. They also leak because people FORGET them when winterizing. They will freeze and then blow water out the next time you flush. I advise to use a BRASS check valve instead of the plastic valves. I cannot remember if I ever had a brass valve leak or fail at all. You can put a standard 1/2 inch check valve in place if you do not want the vented type that comes standard. I believe the Vented standard ones are required by code. Doug

Copy & paste from the instructions for the most popular model:

The atmospheric vacuum breaker shall not be installed where the venting of water from the device during the normal functioning causes damage.

OK, WHERE should it be installed?????? Doug

dougrainer wrote:
The purpose of this check valve is to keep from siphoning black water out of the tank. It is mounted HIGHER than the tank system. 99% of these valves are located in the Bath Lavy sink area. They leak from a few things. BUT THEY ARE NOT SUPPOSED TO LEAK AT ALL. The plastic Check valves do not like high water pressure, especially if you open the fresh water spigot full force. Always start out with a slow opening of your fresh water spigot, then increase to full force. They also leak because people FORGET them when winterizing. They will freeze and then blow water out the next time you flush. I advise to use a BRASS check valve instead of the plastic valves. I cannot remember if I ever had a brass valve leak or fail at all. You can put a standard 1/2 inch check valve in place if you do not want the vented type that comes standard. I believe the Vented standard ones are required by code. Doug

Copy & paste from the instructions for the most popular model:

The atmospheric vacuum breaker shall not be installed where the venting of water from the device during the normal functioning causes damage.

The purpose of this check valve is to keep from siphoning black water out of the tank. It is mounted HIGHER than the tank system. 99% of these valves are located in the Bath Lavy sink area. They leak from a few things. BUT THEY ARE NOT SUPPOSED TO LEAK AT ALL. The plastic Check valves do not like high water pressure, especially if you open the fresh water spigot full force. Always start out with a slow opening of your fresh water spigot, then increase to full force. They also leak because people FORGET them when winterizing. They will freeze and then blow water out the next time you flush. I advise to use a BRASS check valve instead of the plastic valves. I cannot remember if I ever had a brass valve leak or fail at all. You can put a standard 1/2 inch check valve in place if you do not want the vented type that comes standard. I believe the Vented standard ones are required by code. Doug

Dave H M wrote:
i just replaced mine. The second time was a charm thus far. :h

The water expelling occurs only at certain pressures and flow rates, you are not out of the woods yet.

i just replaced mine. The second time was a charm thus far. :h

scootsk wrote:

Lynnmor wrote:
That is a vacuum breaker/check valve for the black tank flusher, the manufacturer states that they can expel water and are to be installed where that water will do no damage. RV manufacturer’s cannot read and put them wherever it is convenient for them. Some folks replace with a higher quality one, but I just simply eliminated the stupid thing and made sure there is a check valve in the inlet. We can expect others to point out the error of my ways.

Where the water will do no damage? Right over two 120 volt junction boxes!! SMH!

Yeah, mine was directly above the twist lock electrical inlet, (you know, the one with the wires completely loose), and right next to my silverware drawer.

Lynnmor wrote:
That is a vacuum breaker/check valve for the black tank flusher, the manufacturer states that they can expel water and are to be installed where that water will do no damage. RV manufacturer’s cannot read and put them wherever it is convenient for them. Some folks replace with a higher quality one, but I just simply eliminated the stupid thing and made sure there is a check valve in the inlet. We can expect others to point out the error of my ways.

Where the water will do no damage? Right over two 120 volt junction boxes!! SMH!

Lynnmor wrote:
That is a vacuum breaker/check valve for the black tank flusher, the manufacturer states that they can expel water and are to be installed where that water will do no damage. RV manufacturer’s cannot read and put them wherever it is convenient for them. Some folks replace with a higher quality one, but I just simply eliminated the stupid thing and made sure there is a check valve in the inlet. We can expect others to point out the error of my ways.

THIS^^^^^^^^^^^^^