Lochinvar PRS2421 AIR PRESSURE SWITCH BEFORE SERIAL # A04, ALL Used in the following models: CH 401, 401, CH 501, 501, CH 651, 651, CH 751, 751, 501, 991, 1801, 651, 1261, 2071, 751, 1441
Lochinvar PRS2421 AIR PRESSURE SWITCH PRIOR TO A04, 1.35" WC PF-V
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