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grey

Advanced Member

Posts: 90

Location: Eastern WA

1

Tuesday, June 28th 2011, 4:08pm

1" backflow preventer in 1 1/4" mailline

I just realized that I might need 1 1/4" main line (poly pipe). Is it ok to use 1" backflow device since 1 1/4" costs twice as much?

Wet_Boots

Supreme Member

Posts: 4,054

Location: Metro NYC

2

Tuesday, June 28th 2011, 7:00pm

I've used one-inch PVBs with two-inch mainlines

grey

Advanced Member

Posts: 90

Location: Eastern WA

3

Tuesday, June 28th 2011, 7:28pm

ok, seems like there's even no 1 1/4" size. I was looking at 1 1/2.

HooKooDooKu

Supreme Member

4

Tuesday, June 28th 2011, 10:38pm

Size doesn't matter, performance at your designed GPM does. You need to look at a pressure loss table/chart for the device you are interested in and see if it's performance at your GPM works for you. Same goes for valves as well.

Mitchgo

Supreme Member

Posts: 502

Location: Seattle

5

Wednesday, June 29th 2011, 12:51am

Size doesn't matter, performance does.
Kid Mode : That's what she said! :P

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