The Drum Jumper is designed and engineered to rotate a mixer drum to mix or discharge concrete in the event of a mechanical, electrical, or computer failure. This portable emergency hydraulic pump works on front and rear discharge trucks. It features a 13-hp Honda engine, which can turn 11 yards of concrete at 1-inch slump, and puts out pressures up to 3000 psi. RSW Companies LLC, 989-705-1564, .