... Under low pressure,the sealing is achieve self sealing through medium,and reserve gaps between pipe ends to compensate for the ... pipelines of fire protection,mines,power,chemical industry and urban water supply and discharge.When it is connected with valves or ... ,16Mn3Seal ring1NBR,EPDN4BoltNQ235A,35,1Cr18Ni9Ti5NutNQ235A,20,1Cr18Ni9Ti C:Package and delivery1General package is wooden box,but we also can ...