This pressure switch is a safety device designed to prevent overheating of the spa heater should a low or no-flow condition exist in the spa.
Brand: Varies (Allied Innovations, Len Gordon)
Compatible with: Universal (Astral, Hurlcon, Raypak, Pentair, Insnrg, Hayward)
Astral / Hurlcon (Part #71580 (OEM) 800122-3):
HX 70, HX 120, HX 150, MX 150, MX 200, MX 250, MX 300, MX 350, MX 400, MX 500, JX 130, JX 160, HiNRG 175, HiNRG 250, HiNRG 400, Viron 250, Viron 350, Viron 450, Viron 550, WX 70, WX 120, WX 150, ICI 200, ICI 400, Jacuzzi and many more.
Raypak (Part #56651284):
131 Gemini, Raypak 200, Raypak 280, Raypak 350, Raypak 430, all RP2100 heaters, and almost all others. (may require 1/8" NPT thread tap and/or Brass Tube Fitting)
Pentair (Part #42001-0060s):
Mastertemp 125, Mastertemp 200, Mastertemp 300, Mastertemp 400
Waterco Turbotemp 125, Waterco Turbotemp 200, Waterco Turbotemp 300, Turbotemp 400, Sta-Rite Max-E-Therm 125, Max E Therm 200, Max E Therm 300, Max E Therm 400
INSNRG (Part #8001403):
GI 160, GI 265, GI 420
Jandy / LRZ / Lite / Teledyne Laars / Zodiac (Part #R0015500, R0011300):
All Models
Davey / Spa-Quip:
EcoSpa, Eco-Salt, and other spa equipment
Jacuzzi:
J-HN250C & J-HN400C heaters, most Hayward heaters and Compu-Heat spa controllers.
WARNING:
CALIFORNIA PROPOSITION 65 WARNING