Centerline Manufacturing, manufacturer of hydraulic drive mud pumps constructed of cast steel, announces a new line of aluminum mud pumps. The aluminum models will weigh about half as much as the steel models, but will be the same size and volume ratings of the steel models. Three models are available. The single cylinder aluminum model, which is rated at 150 gpm, weighs 595 pounds. The aluminum duplex rated at 300 gpm weighs 1,190 pounds, and the aluminum triplex rated at 450 gpm weighs 1,785 pounds. Each model is offered in 750- and 350-psi versions. Centerline Manufacturing, Card No. 282