The NIBCO® Press System copper cap features an inboard bead and yellow HNBR O-ring. Simply applying pressure from a pressing tool tightens the O-ring onto the tube, ensuring a clean, robust seal in seconds with no flame, solder or flux. The cap has a press connection. The fitting is used to fit over the end of pipe to seal the end. NIBCO press fittings are the fastest, easiest way to join copper tubing. NIBCO press fittings are the fastest, easiest way to join copper tubing systems. NIBCO® PressG fittings are designed to join with seamless copper water tube in residential and commercial gas and compressed air systems. The press fittings can also be installed underground. NIBCO® PressG fittings are user friendly, quick and easy to install. When properly crimped a unique "N" witness mark is clearly visible. NIBCO® PressG fittings features a full range of precision engineered copper and copper alloy fittings, commercial valves, accessories, pressing tools, jaws and chains. In addition to its inherent qualities of beauty, durability and low maintenance, copper's reusability makes it an ideal application in sustainable projects.Features:Operating pressure 200 PSI max, (125 PSI for natural gas applications) depending on the application.Temperature range -40°F to 180°FASTM B75 Alloy C12200 CopperIFGC International Fuel Gas CodeNFPA 54/Z223.1 National Fuel Gas CodeNFPA 58 Liquified Petroleum Gas CodeUPC Chapter 12 Fuel PipingNFPA30 Flammable and Combustible Liquids CodeNFPA30A Code for Motor Fuel Dispensing Facilities and Repair GaragesNFPA 31 Standard for the Installation of Oil Burning Equipment (supply line only)Third Party Certified to ANSI LC4/CSA 6.32Third Party Certifiefd to IAPMO/UPC LCL-4ICC-ES PMG 1036.