Air pressure against a solvent resistant diaphragm moves the needle up and down across the fluid ports

leak-proof seal

heavy duty bearing slides

Like all of the Grizzly Planers

Grizzly Industrial Heavy-Duty Ring Roll Pipe Bender 3 in. NPT Air pressure against a solventA pipe bender is a great addition to any metalworkers shop. The G0792 Ring Roll Pipe Bender can be used to create arcs, circles, and spirals. This is achieved by feeding the pipe back and forth through the machine with incrementally greater force exerted by the upper roller. The G0792 is capable of bending with the headstock in either a vertical or horizontal position. Typically, the horizontal position is only needed when bending extra long