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New Member


Wednesday, May 9th 2012, 4:15pm

inlet size?

I am designing a system and wanted to know if there was any advantage to using 3/4 vs. 1/2 inch head inlet size. I am running 3/4 poly and using quick fittings and nipple risers. will using 1/2 inch reduce the flow alot or will I not see much difference?


Wednesday, May 9th 2012, 4:55pm

Generally rotors are 3/4" and pop-ups are 1/2".
Some exceptions.
So that decides your head inlet size.
A good bit more info is needed before good advice can be given.


Supreme Member

Posts: 5,331

Location: Metro NYC


Wednesday, May 9th 2012, 5:53pm

3/4-inch rotor heads will have physically stronger pipe connections, and that's always a good thing.


Advanced Member

Posts: 83

Location: Eastern WA


Wednesday, May 9th 2012, 8:25pm

if I remember correctly if you connect 1/2" riser/funny pipe that is over 18" than you would have a problem.

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