NGD proof flexible connecting pipe | BNG explosion around the connection pipe | DN20-proof hose, FNG proof about the connection pipe to discuss Tel: 13587799049 Scope 20, Zone 21 and Zone 22 dangerous places. Applicable to combustible dust. Application Can be used in Zone 20 zone 21 and Zone 22 dangerous places Can be used in flammable dust atmosphere BNG proof flexible connecting pipe |. NGD proof about the connection pipe | DN20 Features have fire-proof hose, corrosion resistance, water resistance, anti-aging, flexible and firm structure, reliable work. The length, thread size can be specially designed. As NPT thread metric thread, etc. Note: The label should indicate the thread size people external threads. Such as CBR-DIP700 x G3 / 4 (internal) / G1 (out) means a length of 700, one end of the internal thread G3 / 4 ", - end male thread G1" rubber sheath flexible connecting pipe in line with GB12476,. IEC61241 standards BNG proof flexible connecting pipe |. NGD explosion around the connection pipe | DN20 hose-proof