KB Series polybutylene terephthalate piping module connector. Piping module series KB has made distribution easy utilizing one-touch fittings. A locking system makes the use of tools unnecessary for installation of one-touch fittings and makes piping more efficient. Universal construction allows for changes in air output direction after connections are completed. -14.5psi Vacuum rating. 17mm, 19mm Width across flat. 435psi Proof pressure. Air fluid. Brass parts are all electroless nickel plated copper-free.