The 1A Pressure Switch is a reliable safety component used in spa and hot tub systems to monitor water pressure and ensure heater protection. It prevents damage from low-flow conditions by shutting off the heater when pressure drops below the adjustable threshold. With an easy-to-install 1/8" NPT thread and an adjustable 1–5 PSI range, it delivers flexibility and dependable performance in a wide range of setups. Ideal for retrofits or replacements, this switch helps extend the life of your spa’s heater system.