When it comes to fluid transfer applications, the Everflo 12 V on demand 5.5 gpm diaphragm pump is the king the hill. This pump is loaded with features such as a Honeywell Micro Switch?, corrosion-resistant viton valves and Santoprene? diaphragm, fiberglass-reinforced polypropylene pump manifold with 1/2 in NPT ports. Other features include a silky smooth valve design for faster primes and a unique pressure switch that slowly cycles the pump to reduce wear on the motor and switch. Save battery power with the automatic power switch that turns off pump when no flow is needed. CE approved and has standard mounting pattern for quick installation. Approved for use with Round-Up? and other agricultural brand herbicides and insecticides.