This HOME-FLEX Underground 3/4 inch IPS DR 11 compression tee fitting is specifically designed to safely and easily expand outside underground yellow medium-density polyethylene (MDPE) gas piping systems. Constructed from highly durable polypropylene, this Category 1 fitting features an easy-to-install design that connects securely using basic hand tools with no special equipment or tools required. It comes complete with required pipe stiffeners, is rated for a maximum operating pressure of 125 PSI, and is fully IAPMO Uniform Plumbing Code (UPC) certified to ASTM F1924 for direct burial applications. This compression tee is engineered strictly for outdoor underground natural gas or liquid propane installations and must never be used inside or underneath any building or foundation structure