This lightweight hose clamp is used to momentarily shut off the water flow from a 1? Single jacketed fire hose at pressures up to 200 PSI allowing you to change nozzle tips, nozzles, or add or replace fire hose. Convenient, it is small enough to be carried in your pocket. Made from tough aluminum alloy. Our catalogs feature thousands of quality products for the forestry, environmental science, surveying/engineering, wildlife biology, horticulture, grounds maintenance, and education professionals - and more.