Lead Free Press x Male Low Density Adapter NIBCO press fittings are the fastest, easiest way to join copper tubing systems. NIBCO Press System fittings are designed to join with seamless copper water tube in residential and commercial potable, hot, chilled and process water applications for plumbing and HVAC systems. 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. 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. Specifications