This Powerline Plus plunger pump delivers 1800 psi and 1725/800 maximum RPM and features a _-inch NPT inlet, a _-inch NPT outlet, and a one-inch OD solid shaft. The head material is made from a single piece of forced brass backed by a lifetime warranty. The piston guides are also made from bronze to extend the life of plungers and seals; these guides offer larger bearing surface, too.