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Aside from routine cleaning, inspection and lubrication that is recommended, agencies often perform annual flow/pressure test on their nozzles. Care, Use and Service Testing of Fire hose including couplings and nozzles is covered in NFPA Standard # 1962. Performing a simple annual flow/pressure test on your nozzles will identify instances of damage that can have an effect on overall performance. And of course also help insure safe fire suppression operations.