Tecmark 4037P Pressure Switch

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Replaces the heater pressure switch on pool, spa, and hot tub systems that use a 1/8" MPT port - Tecmark 4037P. It proves water flow by closing at the set pressure to enable the he ater, then opens on low pressure to protect it from dry firing. OEM SPST switch with an adjustable set screw for dialing in the trip point. Show more