cylinder hydraulic test, cylinder drying, dry powder/co2/water/foam filling, valve screwing,pressurizing,leakage test. Shijiazhuang Saitu ... also supply kinds of fire extinguishers,fire extinguisher accessories,fire extinguisher agent, fire extinguisher valves, fire hose, fire hose reel, fire cabinet, fire extinguisher cylinder, cylinder, fire extinguisher gauge and etc ...