HM Power Mixers feature push-button start and stop controls, reversible paddles, hydraulic dump, and 1 5/8-in. square paddle shafts. Engines in the HM 8- and 12-cu.-ft. mixers are protected by a housing that allows ample air flow and easy access. These mixers are available in several models: a towable mixer, skidsteer mixer, and rack mixer. Hydraulic Mudpumps Inc. 800-626-2464.