Campbell Hausfeld CW218800AV Pressure Switch 4 Port

CW218800AV Campbell Hausfeld pressure switch is a four-port, unloader-equipped switch designed for Campbell Hausfeld air compressors. It provides 125 psi on, 155 psi off setpoints, allowing the compressor to start when tank pressure drops to 125 psi and stop at 155 psi. The four-port configuration includes an integrated unloader valve that vents the pump head when the switch trips, aiding restart and reducing pressure buildup. This part is used as a direct replacement in Campbell Hausfeld units and is listed as an OEM Husky replacement in some catalogs. The CW218800AV is documented in Campbell Hausfeld service literature as the pressure switch assembly with unloading capability, enabling proper restart sequencing after cut-out and helping minimize pulsations. Common applications include portable and shop air compressors built to CW218800AV specifications that require automatic start/stop control with an unloading function.