Old 08-31-2011, 02:08 PM
Senior MemberCaptains Club MemberPLEDGER
Join Date: Dec 2004
Location: Not in Texas
Posts: 10,213
Default Plumbing Question - Domestic Water Main Size

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?
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