Multi-function Telescoping Design;Regular and Short configurations;Socket x Socket Configuration for Pipe Repair or Use as a Short-Stroke Expansion Joint;Double O-ring Seal in EPDM or high-grade FKM;1/2" - 2" Pressure Rated to 235 PSI @ 73F (23C);2-1/2" - 4" Pressure Rated to 200 PSI @ 73F (23C);6" Pressure Rated to 150 PSI @ 73F (23C);NSF Certified for Potable Water Use