The NIBCO® Press System® wrot copper tee features an inboard bead and EPDM O-ring. Simply applying pressure from a pressing tool tightens the O-ring onto the tube, ensuring a clean, watertight seal in seconds with no flame, solder or flux. The tee has press connections and allows for a connection to be made in a continuous pipeline and branch out to a different direction. NIBCO® Press System® fittings are the fastest, easiest way to join copper tubing systems 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. 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.