... years OEM producing experience 4.color:as you require grooved fitting,victaulic coupling,flexible coupling 1:Usage: 1)Automatic sprinkler ... field,textile,powder plant,etc.3)Pipeline system on subway station ,railway station ,airport, seaport,bridge,etc 2:material: No.NameQtyMaterial1Casing1ZG230- ... .3)Non-wood cases(1CBM). 5:certificates obtained: grooved fitting,victaulic coupling,flexible coupling