Bullet Piercing Valve with padded fitting  - 1/4, 5/16, & 3/8" tubing - For use on process tubes and other copper tubing. Works on refrigerators, window units, freezers, ice machines, water fountains coolers, ect. that do not have an access valve. Recommeneded to sand copper tubing before installing to insure a proper seal. Made by Supco Corp. - Part No. BPV31