BHJ Series explosion-proof union (. 
 Application: Zone 1, Zone 2 dangerous places. IIA, IIB, IIC group explosive atmosphere 
 Features: High quality carbon steel, zinc plated or stainless steel. Thread can be tailor-made specifications, such as the NPT thread, metric thread, etc. Note: The label should indicate the internal and external screw thread specifications, such as CBHJ-G3 / 4 "( in) / G1 "(outer) meaning one end male thread G1". meet GB3836-2000, IEC60079 standard.