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 Use this quick system to find out the nominal pipe size of your existing <a href=””>PVC pipe</a>, which is given below. It works equally well for both <a href=””>Schedule 40 (white) and Schedule 80 (gray) PVC pipes</a>

 Take the first measurement tape and measure from the outer edge of one side of the pipe to the very edge of the opposite side, which is called the “outer diameter.” After that, match that measurement with the following PVC pipe size chart in mm and inches