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2.2.3 Gate Valve[ and Indicator Posts] 2.2.4 Valve Boxes 2.2.5 Buried Utility Warning and Identification Tape 2.3 ABOVEGROUND PIPING COMPONENTS 2.3.1 Steel Piping Components 2.3.1.1 Steel Pipe 2.3.1.2 Fittings 2.3.1.3 Grooved Mechanical Joints and Fittings 2.3.1.4 Flanges 2.3.2 Copper Tube Components 2.3.2.1 Copper Tube 2.3.2.2 Copper配件和接头2.3.3塑料管道组件2.3.3.1塑料管2.3.3.2塑料配件2.3.4柔性洒水软管2.3.5管吊管和支撑2.3.6阀2.3.6.1控制阀2.3.6.2止回阀2.3.6.2止回阀2.3.6.6.6.6.6.6.6.3 Supervisory (Tamper) Switch 2.5 BACKFLOW PREVENTION ASSEMBLY 2.5.1 Backflow Preventer Test Connection 2.6 FIRE DEPARTMENT CONNECTION 2.7 SPRINKLERS 2.7.1 Pendent Sprinkler 2.7.2 Upright Sprinkler 2.7.3 Sidewall Sprinkler 2.7.4 Concealed Sprinkler 2.7.5 Residential Sprinkler 2.7.6 Corrosion-Resistant Sprinkler 2.7.7 Dry Sprinkler Assembly 2.7.8 Control Mode Specific Application洒水器2.7.9 ESFR Sprinkler 2.7.10中级机架洒水器2.8配件2.8.1洒水柜2.8.2吊坠洒水罩架2.8.3管道罩2.8.4洒水装置2.8.5浮雕2.8.5浮雕2.8.6 Air Vent 2.8.6 Air Vent 2.8.7标识标志
UFGS 21 13 13湿管洒水系统，防火保护
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