The NIBCO® lead-free* wrot copper solder pressure tube cap is used in residential and commercial systems such as potable water, air conditioning and refrigeration. Options include cleaned and bagged for oxygen service (medical gas). The tube cap features a solder cup. The fitting is used to fit over the end of pipe to seal the end. Please refer to NIBCO technical data sheets and catalogs for engineering and installation information. In addition to its inherent qualities of beauty, durability and low maintenance, copper's reusability makes it an ideal application in sustainable projects. NIBCO® copper fittings are manufactured in an ISO 9001 certified facility, and 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.