The Flex PLW903ST is a 4-1/2 inch Pneumatic Wet Polisher. The rugged and durable 4-1/2 inch pneumatic wet stone polisher is primarily used for polishing of stone surfaces and edges. This lightweight, powerful and reliable polisher is ideally suited for continuous operation. Air supply and exhaust are combined in one slender wrap hose. The exhaust is blown out to the back, away from the user and the workpiece. Specially designed for stationary polishing environments. Operates with 30 SCFM at 90 PSI.