... flange, pad type flange, loose hubbed flange, welding plate flange, welding neck collar, welding-on collar, loose plate flange, companion flange and ... , 2634, 26358.Usage: connecting pipe line and keep its leakproofness; convenient for replacing pipe line; easy to separate and ... check the situation of pipe line; easy to seal pipe line9.Application area: Connecting various pipelines, ...