The Annovi Reverberi Complete Pump 3700PSI@4GPM (RKV4G37-PKG) comes complete with pressure regulator, water inlet fitting with filter, easy start valve, thermal relief valve and oil. Just mount pump, set the pressure and your ready to go. AR RK Series Plunger Pumps are designed for a wide variety of high pressure washing applications. They are constructed of die-cast bodies and feature a forged brass head. Internal components include special thick solid ceramic plungers for long life and durability.