BACOENG AC110V Self Priming Water Pressure Diaphragm Pump 4.5GPM 17L/min 40Psi Caravan/RV/Boat/Marine On-demand, automatic water pump for boats, campers, and vans. Self-priming allows it to be mounted above tank Built-in 40 PSI pressure switch automatically turns the pump off when pressure builds up such as turning off the tap & will automatically turn back on when you turn the tap back on. IMPORTANT: Rated Flow is 4.5GPM. Long Time Operation at Small Flow/Leakage Would Damage Pressure Switch Very Quickly. 9 feet Self priming, capable of being run dry. Quiet operation. Changeable Pressure Switch. Spare Parts Supported. Thermal overload protection automatically stops motor should it overhear due to overload, with auto re-start feature To increase the pressure setting, tighten the screw. To lower the pressure setting, loosen the screw. After you have adjusted the setting, don&#039;t forget to replace the cover. 3/4&#034; Pagoda-Type 90 bending joint(13.8mm) 3/4&#034; Pagoda-Type straight joint(13.8mm) 1/2&#034; Thread straight joint Water Filter -1/2&#034; Thread straight joint