PVC Fittings Size Chart

Buying PVC pipe fittings is confusing! Use this guide to help you choose the right size.Pipe fitting illustration

Most Important Fact: PVC Pipe and fittings are identified by the INSIDE diameter (ID) of the PIPE, which is the “nominal” size.

The fittings are larger than the pipe of course, but their SIZE NAME remains the same as the pipe. For example, 1¼” pipe (ID) is approximately 1-5/8″ in diameter on the outside. Naturally the fittings that the pipe connects to have about a 1-5/8″ hole in them so the pipe can slide into them. However, the fittings are still named by the PIPE SIZE that they connect to – in this case 1¼”.

Our PVC pipe is sold in sizes of 1-1/4″, 1-1/2″ only. The “size” name for the pipe is based on its inside diameter. In both cases the name of the pipe roughly equals the inside diameter of the pipe. The only thing that changes is the wall thickness.

The outside diameter ALWAYS remains the same.

All our PVC fittings are Schedule 40 high-gloss furniture-grade.

All you have to remember is that 1¼” pipe fits into 1¼” fittings, and 1½” PVC pipe fits into 1½” PVC pipe fittings.