Trident’s patented AirPrime Pump Primers providesignificant advantages over electric primers. Automatic, Manual, and Industrial versions are all powered from the air brake system, minimizing the impact load on the chassis electrical system. Vacuum is created with no moving parts, and there are no water lines to the pump panel so freezing is eliminated. Choose single or multi-location options. AUTO PRIME mode automatically engages the primer, ensuring constant prime.AirPrime Primers quickly and easily install on new apparatus or as a retrofit to replace electric primers. NFPA compliant.