Tecmark Pressure Switch 1 Amp - SPST - 1-5 PSI - Plastic 3903-DF (3903) is a safety device that the heater needs to work properly. This universal pressure switch from Tecmark combines both plastic and stainless steel materials, with a plastic primary case and thread, along with a stainless bottom to add to the overall rigidity and longevity of the piece without opening itself up to the corrosion issues that affected older pressure switches.

• Switch Type - Pressure
• Pressure Switch Rating - 1 to 5 psi
• PSI Rating - 1 to 5 psi
• Pressure Switch Amperage - 1A
• Thread/Pan Material - Plastic
• Plumbing Connection Size - 1/8"
• Plumbing Connection Type - Male Pipe Thread (mpt), Male National Pipe Thread (mnpt)
• Pole/Throw - Single Pole Single Throw (spst)
• Pan Material - Plastic

Additional information:
Alternate part numbers - 47-319-1065, 3903-DF, TDI3903DF