How To Determine The Right Pipe Size for You

Get a piece of string about 6" long and find the location of your water supply pipe (either in your garage, side of house, or front of house). You will know it's your main supply pipe when you see a shut off valve that shuts off all the water to your home. Strip away any insulation so that you can get at the pipe and wrap the string around it. Measure how many inches of string it takes to go around the pipe once. This is the circumference of the pipe. Using the circumference we can calculate the diameter of the pipe. Based on the string length use the tables below to find your pipe size.

For Copper Pipe                           For Steel or PVC Pipe

2.75”  = ¾” pipe                           3.25”  = ¾” pipe
3.53”  = 1” pipe                            4.00”  = 1” pipe
4.32”  = 1 ¼” pipe                        5.00”  = 1 ¼” pipe
5.10”  = 1 ½” pipe                        6.00”  = 1 ½” pipe