The push/pull 4 port air compressor switch is a pressure actuated Electric switch designed to maintain tank pressure between two preset Values on an electrically driven air compressor. An UNLOADER valve prevents the compressor from starting under pressure. A four port manifold style provides means for easy mounting of valves and gauges. 1/4-inch National pipe thread. Psi set points from 95-125. Your one source for exceptional quality and service. At K-T Industries we strive to make things simple and easy for our customers. We are dedicated to delivering high quality products at competitive costs. We strive for Mutual sales growth and two-way communication with our customers. Service always comes first. Lifetime warranty - tools: socket sets, sockets and accessories, adjustable wrenches and combination wrenches. 90 day warranty - tools: hex bit sockets, screwdrivers and screwdriver tips, impact drivers, pliers, torque wrenches, hammers, threading and cutting tools, crimping tools, pipe wrenches, gear pullers, porta pullers and clip holders. K-T Industries will repair or replace, without charge, any k-t tool which may fail to function properly within the warranty period by reason of defective workmanship or material. This warranty does not apply to defects due, directly or indirectly, to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities or a lack of maintenance.