You are buying a Tecmark 4000 Series 25Amp Pressure Switch with a Plastic Bottom and stainless top. Features a 1/8th" MPT Standard Thread to thread into your heater and 2 Spade connectors for attaching the 2 wire connections. This field adjustable switch can be adjusted from 1-5 psi. Can be used to replace many other SPNO pressure switches with ratings from 1-25 amps.

This Switch will fit Barksdale, Balboa, Gecko, ACC, Hydroquip, Len Gordon, Maddux, CTI, Challenger, United and most other standard Hot Tub Heater Tubes. If you have an older air driven / mechanical 115V Plugged in style where the hot wire for the Heater runs through the switch, then this is teh switch for you.

What goes wrong with these switches? The Switch does not close when the pump comes on and puts pressure on the switch or it doesn't open when the pump goes off. If either of these things happens you will have a No Heat or Overheat Situation on most systems with codes such as FLO, FL, FLC, OH, HL and others. Before replacing your pressure switch be sure the pump is running correctly, that your filters are clean, you have a proper water level and that all the spa jets are open.