Check Valves

Originally Posted by jpdutton

Why where does your return enter the tank?

I am not quite get what you mean ? - But I think you mean where does the hose enter to tank for return line. my tank is custom design. I sketched it myself with return right on the backwall 2/3 uptop, not up to the air and back in water like many other tank. Thanks

Originally Posted by victornguyen

i got 1.5 true unoins if you want them got 2 extras. I got two on my tank. cant see them failing for many years. Its like saying "dont buy that power head as it will eventually fail...."

You mean 1.5 inch ? - My pipe is only 1/2 inch. But thanks for the helps.
I also agree with you about equipments' failure. And even if it might fail due to dirty clogging, we can prevent by cleaning it thouogh.