Fluid-O-Tech rotary vane pumps are manufactured from brass and also available in stainless steel; feature a stainless steel AISI 303 or 304 rotor, while the pumping chamber and the vanes are carbon graphite. The pumps offer various flow rates which are shown below. The inlet and outlet ports are threaded 3/8" and 1/2" NPT. Pumps are equipped with a built-in by-pass; a special balanced by-pass (able to maintain the set pressure for variation of the inlet pressure).