Fire Sprinkler Head Emergency Shut-Off Tool Quickly shuts off accidentally activated fire sprinklers and can stop damage caused by open sprinklers without shutting down the entire system, effectively reducing water damage and keeping buildings safe. Suitable for many types and sizes of fire sprinklers 4" long, 3.5" high, and only 3 oz. Tool that stops 1/2" and 3/4" sprinkler heads for conventional, upright, hanging and sidewall fire sprinklers as well as recessed sprinkler heads Simple one-handed operation: The fire sprinkler head emergency shut-off tool resembles a reverse clamp with a sealing rubber ring on one side and a fixed base on the other. Insert the shut-off tool into the fire sprinkler head and twist the handle to hold the tool open until the water stops flowing, effectively stopping the water from escaping. Peace of Mind: The Emergency Shut-Off Tool Sprinkler Tool is tested to hold in place under water pressure up to 400 PSI, making it an essential tool for firefighters, construction workers and building managers. The sprinkler emergency shut-off tool is made of hardened stainless steel. It will not rust in wet conditions and will remain in your toolbox for years. A must-have indispensable tool for the home or office.