NIBCO press fittings are the fastest, easiest way to join PEX tubing systems. NIBCO Press System fittings are designed to join with PEX tube in residential and commercial water distribution, radiant floor heating, municipal water supply, geothermal climate control, snow melt and drip irrigation. The press fittings can also be installed underground. The NIBCO Press System is user friendly, quick and easy to install. When properly crimped a unique ''''N'''' witness mark is clearly visible. Please refer to NIBCO technical data sheets and catalogs for engineering and installation information. NIBCO Press System applies the proven performance of press technology to NIBCO valves and fittings - the most specified flow control products in the industry. The NIBCO Press System 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. NIBCO Press System copper fittings are backed by a 50-year limited warranty. Because of its longstanding reputation for innovation and precision in design and manufacturing, NIBCO is the preferred brand in the industry.