A single action manual piston pump used to actuate fixed output positive displacement oil injectors. The unit can be used with series Zjb, Zmb, ZT and Sjm injectors. The pump incorporates an internal maximum pressure relief valve and a flow control valve to relieve distribution line pressure as required for normal operation of positive displacement oil injectors. models are offered with a delivery connection outlet on left or right sides of the unit. A dual outlet (left and right sides) is  also available.