Vacuum drilling unit for production of branch connections for metal or plastic pipes is operatable with use of conventional drilling machines and sealing hoods or welded connector pieces

摘要

The vacuum drilling unit for production of branch connections for metal or plastic pipes conducting water and noninflammable gases and other fluids under pressure for domestic industrial purposes is operatable with use of conventional drilling machines and sealing hoods or (in the case of steel pipes) welded connector pieces.