10/01/2026
Same nominal size, different outside diameter. A 1" CTS pipe (1.125" OD) and a 1" IPS pipe (1.315" OD) are not interchangeable — mixing them is the #1 spec error in the field, and it ends in pipe that won't mate with what's already installed.
TDR Forza Flow® HDPE pressure pipe comes in two series — CTS and IPS — built from PE4710 resin and NSF 61 certified for potable water, irrigation, and agriculture.
Our new guide breaks down each series, the full specifications, and how to choose the right one
https://tdrpipe.com/tdr-forza-flow-hdpe-pressure-pipe/