ONE PLUS

Branching pipes, not of metal; Drain pipes, not of metal; Ducts, not of metal, for ventilating and air-conditioning installations; Gutter pipes, not of metal; Pipes of cement, earthenware or sandstone; Plastic conduit for irrigation; Rigid pipes, not of metal, for building; Sandstone pipes; Sewer pipes, not of metal; Water-pipes, not of metal