We offer a wide range of pilot valves and unloading valves for many applications: Pilot Valve The P25 valve is an adjustable pilot valve with a ¼” NPT inlet and an ⅛” NPT outlet port which can be used to pilot head unloaders or used with a throttle control to slow down the engine during cut-out.  The P25 pilot valve has a 3/8-16 UNC mounting boss, and comes standard with an unloading sleeve for gas engine warm up.  Options include a toggle for one hand unloading, a lock out thumbscrew for dual systems control, and a ¼” nipple for the inlet.  Refer to the Pilot Valve section of our Products web page for details on the cut-in and cut-out ranges. Venting Pilot Valve The P25V unloader incorporates all of the P25 options along with a vent valve to unload the compressor discharge after cut-out.  The vent valve on the P25 has a ¼” compression fitting which must be connected to the compressor discharge line.  The P25V offers all of the same options as the P25, except for the mounting boss. Venting Unloader with Check Valve We offer a complete line of self-contained Continuous Run Vent unloaders.  These valves incorporate an adjustable pilot valve, vent unloader, and check valve that perform all of the functions required for continuous run compressors.  Options include a ¨û” NPT tapped port for throttle control as a gas engine, a toggle unloading lever for one-hand warm up, and a vent port muffler.  Depending on flow and space requirements, we offer the Mark II, Mark III and Mark IV series of valves.  Visit the Products section of our web site to find out which valve is right for you.