Featuring a natural core with carbon black exterior, PWPipe¿s Pure-Core pipe material is medium-density PE 2406, meeting cell class 224343A. These pipes meet the requirements of ASTM D 2239 and are listed for potability to ANSI/NSF Standard 61. Color-coded tags denote product and pressure rating for improved warehouse control. Available in SIDR 7, 9 and 11.5, Pure-Core pipes offer a 50-year warranty. PWPipe