double cartridges for two - component compounds manufactured in one piece by injection molding have separate reservoir cylinders . discharge channels starting from each cylinder space are separated in a common orifice by two wall sections which start from separate cylinder walls and are brought in duplicate up to the channel end ; in addition , the channels receive a separate closure inserted axially from the outside . the one - piece connection at the orifice occurs either by an end - face web between the wall sections or through circumferential sections of an orifice ring embracing the channels . as a result , the diffusion paths in the plastic material of the cartridge are extremely long . yet the advantages of the one - piece double cartridge with respect to manufacture and handling are preserved . a variant with longitudinally bored closure remaining in the orifice is described , which forms together with a rotatable slide element a seal intended for opening and closing .