This copper pressure tube cap is used in residential and commercial systems such as potable water, air conditioning and refrigeration. The tube cap features a solder cup, which is used to fit over the end of pipe to seal the end. In addition to its inherent qualities of beauty, durability and low maintenance, copper's reusability makes it an ideal application in sustainable projects.UL 207 recognized to 700 psi select diametersDezincification resistantThird-party certified to NSF/ANSI 61 and 372Material and workmanship per ASME B16.22Options include cleaned and bagged for oxygen service medical gasSize range 1/8 in. to 4 in.