VEVOR Diaphragm Pump, 3 GPM (11.36 L/min), 3-Chamber 12 Volt DC Water Pump with Automatic Pressure Switch 40-100 PSI Adjustable, 50 PSI, 1/2'' MNPT Port, for RV Yacht Food Truck Camper Marine

There is a pressure switch; it's the black part on the pump head. If this answer does not resolve your current issue, please contact us again for assistance.