NOTE: 8" SDR-26 IS DUAL MARKED FOR SCH-40 PIPE.

Is SDR 21 the same as Schedule 40?

40 pipe has a thicker wall thickness than SDR21 pipe. For pipes 2-1/2" and smaller, it is over 150% thicker.

Is SDR pipe schedule 40?

The outside diameter is the same as Schedule 40, so it is compatible with all Schedule 40 and Schedule 80 fittings. Used mainly in stormwater and drainage applications, SDR 35 is a medium-strength pipe that falls between Schedule 20 and Schedule 40 PVC pipe.