Industrial CW212700SJ Four Port Pressure Switch

The CW212700SJ four-port pressure switch is a replacement component for air compressors, offering a four-port base and a 95–125 PSI switching range to control when the compressor starts and stops as tank pressure changes. It is intended to replace worn or failed switches and to help maintain target pressure by switching the compressor on or off in response to sensed air pressure. The four-port design supports multiple plumbing connections in typical installations, enabling separate lines for the primary air path and an auxiliary control or unloader path depending on the setup. With a 95–125 PSI range, this switch is suited for applications that require consistent mid-range pressure while minimizing short cycling and motor wear. When selecting a CW212700SJ replacement, ensure the port layout and mounting align with your compressor model to ensure proper installation and sealing.