Webster 1/4" NPTF, 3450 RPM, two-stage M Series fuel pump with a capacity of 6 GPH at 100 psi. Vacuum capability up to 15" Hg. Rated for use with #1 and #2 fuel oil or kerosene. Nozzle port pressure at cutoff is not less than 80% of set pressure. This pump is for use on one- or two-pipe installations. The pump's double lip type seals assure low starting torque and provide positive protection from leaks. M series fuel units utilize a rotary filter unique to Webster in order to minimize maintenance.