jcm412;2526289; said:When you guys make a DIY overflow out of pvc pipe how do you decide on the pipe diameter?
Depends on tank size.
Do you glue the pvc pipe together?
Yes.
If so what do you use to glue it?
PVC primer and glue.
rallysman;2556636; said:1" should work fine for a 150 unless you want some crazy amount of flow. Even at that, you could make 2 1" overflows in case one of them plugs or gets trapped with air.