Par-Max HD4 Heavy Duty Water Pressure Pump - 12V - 4 GPM - 40 PSI. HD (Heavy Duty) models include a wider diameter motor with a powder coated shell, cast aluminum endbells and lower housing to improve pressure capability and life. Configurations up to 6 GPM (23 LPM) and 60 PSI (4.1 BAR), these pumps deliver exceptional performance. Standard models provide good performance in an economical footprint. These configurations are 1-3 GPM, perfect for vessels with 1-3 outlets. A plastic housing protects the motors on these units from corrosion. Co-molded diaphragm technology for long life and durability. HD models feature heavy duty, motors and cast aluminum lower housings which allow for longlife, even at high pressures. Efficient and quiet operation. Integrated, sealed pressure switch for on-demand operation. Features Self-priming allows for installation versatility Can run dry without damage Quick connect ports for ease of installation, servicing, and maintenance Vibration dampening mounting feet Equipped with integrated bypass module to reduce cycling and provide smoother flow Specifications PSI: 40 PSI GPM: 4 GPM Voltage: 12V Motor Design: Brushed, permanent magnet TENV Pumphead Upper Housing Material: Glass fiber reinforced polypropylene Diaphragm: Co-molded TPV Check Valves: EPDM Max Inlet Pressure: 30 PSI (2.1 Bar) Fluid Temperature Range: 32°F140°F (0°C60°C) Dry self-Priming Capability: 7ft min (2.13m/min) Certifications: CE, ISO8846, RCM Ingress Protection: IPX6 Weight: 7.85 lbs