OUR 12 VOLT MOTOR PUMP UNIT CAN BE USED TO REPLACE MOTOR PUMPS IN ALL SINGLE CYLINDER, 12 VOLT INSTA-TRIMR SYSTEMS. THIS PUMP UNIT COMES WITH A HOUSING, RESERVOIR, MOTOR, PUMP, SOLENOIDS, AND BRASS HOSE FITTINGS, ALL READY ASSEMBLED, ALLOWING FOR EASY INSTALLATION.