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This Universal Pressure Switch fits all major brands of spa controllers that has a Pressure Switch installed on the heater. Model SG-3903. 1 amp at 120 VAC (inductive), 72 VA pilot duty at 24 VAC. Approximately 2.5 long and 1.75 inch in diameter. Fits in 1/8 inch NPT hole, and has 3/8 inch plastic thread. Easily adjustable from 1 to 5 PSI, and is shipped factory set at 1.5 PSI.
SpaGuts P/N: 45-100-1410
Replacement option for the following pressure switch part numbers or models: Tecmark 3902, 71586, 34-0178, 5-20-7001, 3903-DF
This item comes with 1-year limited warranty, and is NON-Returnable.