Air vent

[Atlantisdelux]

Anyone ever run one of these on their supply side to prevent syphoning during power outage/pump failure?

 

[mcarroll]

Most folks just drill a hole somewhere in the return plumbing at the waterline. I've never seen one of those used anywhere.

 

[Atlantisdelux]

I thought about just drilling holes, but #1 I don't really want to drill the loc line and that's the only part under water, and #2 I have a lot of thinking time at work and like to think outside the box.
I may send them an email just to see if there's any metal part and maybe give it a try, I'll keep this thread posted.

 

[don_chuwish]

The simpler solution is just having the fan nozzle (at end of loc line) up near the surface to begin with. Water siphons back down until just below the mouth of the nozzles. Still plenty of room in the sump for more in my case. Relying on valves sounds dangerous.

 

[AZDesertRat]

As long as you keep the returns close to the surface and you maintain sufficient room in the sump to contain a couple gallons of backsiphonage drilled holes and check valves are not needed. They fail anyway, nothing beats a simple air gap created when the return is exposed to atmosphere.

 

[wkscott]

The more you add to your plumbing usually the higher the chance of something failing. Valves especially since all it takes is a snail or some algae to plug it up. Black valves won't allow you to see if the valve becomes plugged.