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This pressure switch is for the Millivolt heaters. If your pool heater has a pilot light, it is a millivolt heater. This pressure switch has 3 adaptable fittings, and that is is the reason that the 3902 is preferred by most swimming pool service people. They can carry one pressure switch and it works on almost all Millivolt heaters. The pressure switch is the leading cause of heater failure. If your heater won't fire whenit needs heat (and the pilot is lit), do 2 steps to see if the pressure switch is defective.
If the heater fires up. replace pressure switch. Do not leave jumper wire on the heater. The 3902 Universal Pressure Switch 1-5 PSI, 1.0 Amps, replaces:
On Jul-03-08 at 14:53:50 PDT, seller added the following information: On Jul-04-08 at 10:36:58 PDT, seller added the following information: On Feb-14-09 at 09:24:56 PST, seller added the following information:
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Shipping and handling Item location: Boardman Ohio, United States Shipping to: United States, Canada
 
*The estimated delivery time is based on the seller's handling time, the shipping service selected, and when the seller receives cleared payment. Sellers are not responsible for shipping service transit times. Transit times may vary, particularly during peak periods.
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