Device for mounting of vapour pump on ground neck flasks

摘要

The lower part of the cylindrical pump body (6) houses coaxially in the inlet orifice (5) of the neck (4). The housing is conical and widens upwards into the neck. A plastics collar (12) on the lower part of the pump body has a peripheral conical wall (16) on which is an annular rib (17) forming a sealing joint. A plastics conical peg (18,19) fits and seals the collar (12) and the neck (4). In the lower peg wall is an annular groove (20,22) in which the annular rib (17,21) of the collar (12) houses. A collar (14) on the pump body covers the upper face of the neck (4).