Bubbler, Pressure Release, Airfree, Schlenk. Design of bubbler allows for fine control of purge gas within an inert gas system such as a manifold. Purge gas enters bubbler thru hose connection A & exits thru connection B which is connected to manifold. The large capacity of main chamber C allows for rapid purging w/check valve protection of the inert gas source D. The constriction of the large chamber prevents oil from being drawn back into the system. The small chamber E is equipped with a pressure release valve that is adjustable from 2 to 49 PSI (4 PSI is recommended for most vacuum, inert systems). When charging the system to the correct pressure setting, the bubbler in the main chamber will cease to operate & permit any over-pressure to escape thru small chamber E. Approx dimensions are 150mm W x 300mm H. Hose connections are 11mm OD at the largest ring.PLEASE NOTE: CHAMBER D & E MUST BE FILLED HALF WAY W/MINERAL OIL FOR PROPER OPERATION.