Cat Pumps offers a line of triplex high-pressure plunger pumps with gearbox for easy direct mount onto 5- to 20-hp gas engines. The gearbox pump is designed to create a compact and portable pressure cleaner while eliminating belt adjustment and wear concerns. These gearbox pumps deliver from 3.5 to 5.5 gpm and 2,200 to 5,000 psi. They fit either a 1-inch or 1 1/8-inch engine shaft.