Use of rubber couplings

[smgchandler]

i am using 2 of these couplings and they came from Lowes - they have 4 clamps and they work great but let me give a word of caution - on the pressure side between the pump and valve mine came apart when i needed to backwash - pressure wasnt terribly high but the pvc pipe slid right out of the couple and if had not been standing outside of the pool house and heard it then it would have drained 40k of pool water into pool house with 220v all over it so make sure you tighten clamps and keep an eye on the rubber to make sure its holding up - from taht point on im cautious about leaving home or coming inside with pump running - i dont usually run the pump unless we are out there unless im going to be back and forth all day - if i had it to do over i would not use the rubber and plan to put a pvc coupling in there - i had to replace the pump because of a inline chlorinator ate everything up because i didnt run it all the time - chlorinator is gone and i went with rubber coupling just because of ease of fixing it - if you can easily use pvc i would just for piece of mind

[sevver]

I have used mission couplings and air tested the lines to 5psi before. Sewer lines, and house services. These were 6" - 12" and when you put air to them, they would blow up like a balloon, but they never failed. Usually we would try to have them buried though when we did it. Sometimes the only way to tell if you solved the leak was to go about it like that.

With that said, you are not really creating any pressure like that are you? It is a suction, and the return should not have much resistance. But, there are couplings called no-shear ones, and they have in addition to the two hose clamps, a stainless steel sleeve around it.

I think it would work, now would I do it, no. I would use a union, whatever the benefit of using a mission coupling would be, it would matched and exceeded by a union.