Pres Air Trol PATTNP411R18PF Pressure Switch
The PATTNP411R18PF is a pressure switch by Senasys PresAir. It's designed to control the pressure in various pool and spa equipment. This particular model is a 1.8 PS1 falling pressure switch, which means it activates at a pressure of 1.8 PSI and turns off when the pressure falls below that level.
