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Amazon.com: Square D Diaphragm Pressure Switch, Differential: 6 to 30 psi, Range: 3 to 150 psi, NEMA Rating 4, 4X, 13 : Industrial & Scientific
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Square D 9012GAW5 Single-Stage Diaphragm-Actuated Pressure Switch, 3-150 psi Press. Range, NEMA 4, 4X, and 13 Enc., 1/4"-18 NPTF Press. Connection, SPDT Contacts: Electrical Outlet Switches: Amazon.com: Tools & Home Improvement
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