Return pump question

[Wayne]

Hey I fired the return pump on my sump and after shutting it off I noticed it started to reverse flow My options are keep the return nozzles above the water line or put a one way valve to prevent sump overflow but I am not sure where to get a valve... Its 3/4" pvc, thanks!

[reefwars]

keep your return nozzles just below your water line that ways whenb the power goes out it can only syphon a little bit ,get it wherte you want it and shut the power off and see if it fills your sump, have it in a spot where if a syphin starts it can only empty out so muchcheers wayne buddy

[reefwars]

if you want wayne when i get some free time i will come down and help with your plumbing plus ill get to see the tank lol