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These Ansul-style rubber blow off caps are designed to protect the fire suppression nozzles of R-102 automatic cooking hood extinguishing systems from the buildup of dirt and grease. They are flexible rubber and will blow off the nozzle when the automatic fire suppression system is activated. Blow off caps should be replaced once a year. These caps are not for use with Ansul's newer streamlined nozzles.
These caps are sold in packages of 10 and 50 and are functionally equivalent to Ansul part # 77965. For metal blow off caps see item # 09981.