When it comes to fluid transfer applications, the Everflo 12V On-Demand 4.0GPM Diaphragm Pump is the king of the hill. This pump is loaded with features such as a Honeywell Micro Switch™, durable Viton valves & Santoprene™ diaphragm, fiberglass-reinforced polypropylene pump manifold with ½” NPT ports. Other features include a silky smooth valve design for faster primes & a unique pressure switch that slowly cycles the pump to reduce wear on the motor & switch. Save battery power with the automatic power switch that turns off pump when no flow is needed. CE approved & has standard mounting pattern for quick installation.