NSF 61 Certified-Ensuring safety when used in drinking water systems;High Capacity and Pressure-Specifically designed to deliver high capacities at deeper settings;Stainless Steel Pump Shaft-Hex design provides positive drive for impellers and eliminates clearance adjustments;Easy to Service-Can be taken apart for service by removing four bolts;Corrosion Resistant-Glass filled thermoplastic impellers. Stainless steel wear rings and coverplates. Electro-coated paint process applied inside and out and then baked on;Powered for Continuous Operation-Pump is designed for continuous operation. All ratings are within the motor manufacturer’s recommended working limits;Easy to Prime-Top mounted vent plug allows air to escape from seal cavity during initial priming;Adjustable Automatic Pressure Control Valve-Guarantees maximum capacity at all times;Bypass check valve equalizes pressure in entire system and helps prevent loss of prime