Twin Disc PO Air Clutches, available in sizes up to 1067 mm (42 in), are designed to give the user maximum dependability and lowest possible installation and operating costs. They are used extensively by leading manufacturers of drilling rigs, draw works, rock crushers, tractor winches, pipe-extruding machines, machine tools, pug mills and other industrial equipment. Twin Disc PO Air Clutches are available in triple-plate, double-plate and single-plate construction.