• Replacement Heater Pressure Switch 

• Brass Fittings 

The Tecmark Spa & Hot Tub Heater Universal Pressure Switch Ð 3902 is a replacement heater pressure switch. This pool heater is designed to be an effective replacement pressure switch. This Tecmark heater pressure switch has brass fittings that are designed to withstand extreme temperatures. The Tecmark 3902 is a universal pressure switch and it can effectively replace a variety of heater pressure switches.