... and smelting work at such places with thick smoke, poisonous gas or anoxia inside oil tank or engine room. Usually, it ... sewage and gas pipeline etc.Product structureThe device generally consists of stainless steel body, 4 air cylinders, 2 high pressure connecting ducts ... reducer base, 1 reducer, 1 high pressure meter, 1 meduim connecting pipe, 1 quarter body, 1 medium pressure meter, 1 reel and ...