Old 08-31-2011, 08:15 PM
Senior Member
Join Date: Feb 2007
Location: Trussville, AL
Posts: 857

Originally Posted by Eyeball View Post
I know some of you folks can easily explain this to me...

Plumber just did calculations for a home's water service, says minimums are:

(1) 3/4-inch pipe for domestic water main (from city main into the house),

and then

(2) 1-1/4-inch pipe inside the house until enough "units" fall off, then the pipe size can be reduced.

My question: how can a smaller 3/4-inch domestic water main pipe be made to support a much larger 1-1/4-inch pipe inside the house?
Most all installations require a pressure regulator. The 3/4" is on the high pressure side the 1 1/4" is on the low pressure side......
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