Reed's CSO1 is a Copper Shut-Off Tool. It has a 3/4 In. - 1 In. capacity. It weighs 7. 9 lbs. This tool is designed to shut off and reshape 3/4" through 1" Type K copper tubing. It swings open to go around the pipe, and it's fine threads on the screw provide smooth, easy tightening. It's sliding bar handle is used to increase leverage for turning and to permit work in tight places, and can be positioned in two different spots, depending on where there is clearance. The bottom open area of the shut-off tool is used to reround the tubing to allow 80-90% return of flow, and all parts are corrosion protected for long service life. It is recommended to grease fittings for lubrication to yield long tool life and easy operation.