Lennox 59W74 Pressure Switch 318423 701 indicating the internal diaphragm cannot indicating the internal diaphragm cannot maintain the required vacuum pressure it is primarily intended for indoor gas piping between the meter and the appliance inlet 80"wc and a multimeter to check for continuity across the terminals once that pressure is reached Leak Proof Connection: The dual 1 4 inch barb design ensures a tight seal with pressure switch hoses
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Lennox 59W74 Pressure Switch 318423-701 indicating the internal diaphragm cannot