Water Supply Fixture units and minimum fixture pipe sizes

Water Supply Fixture units and minimum fixture pipe sizes for copper pipe.

Individual Fixtures	Min pipe size	Private Home
Bar sink	½”	1.5
Bathtub or bath/shower	½”	4.0
Clothes washer	½”	4.0
Dishwasher	½”	1.5
Hose Bib	½”	2.5
Hose Bib, each additional	½”	1.0
Kitchen Sink	½”	1.5
Laundry Sink	½”	2.0
Lavatory (bathroom sink)	½”	1.0
Shower	½”	2.0
Toilet gravity tank 1.6	½”	2.5
Toilet gravity tank 3.5 >	½”	3.0
Whirlpool bath	½”	4.0

A standard one-bath home with kitchen sink, dishwasher, water heater, clothes-washer, 1.6 tank toilet, lavatory, tub/shower combo and two hose bibs would be counted as 18 fixture units.

Most standard two bath homes consisting of kitchen sink, dishwasher, water heater, clothes-washer, two 1.6 tank toilet, two lavatories, one shower, one tub/shower combo, and two hose bibs would be counted as 23.5 fixture units.

Most standard three bath homes consisting of kitchen sink, dishwasher, water heater, clothes-washer, three 1.6 tank toilet, four lavatories, two showers, one tub/shower combo, one whirlpool bath and two hose bibs would be counted as 34 fixture units.

" 1" CPVC will have about the same opening as 3//4" copper, the 3/4 will be the equivalent of 1/2" copper, and forget about 1/2" CPVC for anything other than a single fixture, (and keep its length as short as possible), since its bore is miniscule." hj

Pressure range, 40 to 60 PSI, at a developed distance of 80 feet for copper pipe.

Meter and street service (ends at the meter)	Building supply and branches (begins at the meter)	Fixture units (add from chart above)
¾”	½”	6
¾”	¾”	19
¾”	1”	36
¾”	1-1/4”	39
1”	1-1/4”	76
1”	1-1/2”	85