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 How to Choose Fire Hydrant coupling

Before choose Fire Hydrant coupling first need to check couplings standard and size, including: Storz fire hose coupling, Machino couplings, british instantaneous coupling, male and female coupling fire hose, fire hose fittings and adapters etc.And according to fire hose different flowrate requirement to choose different size: 1. DN 50,flowrate is 12L/S. 2. DN65, flowrate is 18L/S. 3.DN80 flowrate is 24L/S. 4.DN100 flowrate is 32L/S 5.DN150 flowrate is 60L/S