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Cleveland Controls DDP-109-203M Pressure Switch Els PW 17895 If the switch remains openThe Cleveland Controls DDP 109 203M is a professional grade dual pressure switch engineered for precise air monitoring in high demand HVAC and energy management systems. This unit features two independently adjustable SPDT snap acting switches mounted on a single foot bracket, allowing technicians to establish a specific "deadband" or dual actuation points for complex control circuits. With a differential pressure range typically spanning 0. 05" to 2.