Jabsco ParMax HD4 Diaphragm Pump 1/2 Inch 12V – Q401J-112S-3A

The Jabsco Par‑Max HD4 is a heavy-duty 12 V freshwater pressure pump designed for boats, RVs, and motorhomes. Perfect for supplying on-demand water to sinks, showers, and multiple outlets, it ensures reliable flow in mobile living environments.

This pressure-controlled diaphragm pump delivers up to 15 L/min (4 GPM) open flow and has a max operating pressure of 25 PSI (1.7 bar). It starts/stops automatically via its sealed pressure switch. Its four-chamber Santoprene diaphragm with EPDM check valves provides long life, while self-priming and dry-run capability allow flexible installation. 1/2″ (13 mm) quick-connect hosebarb ports with inline strainer simplify plumbing, and vibration-dampening feet ensure quiet, smooth operation.