The same proprietary design is also built into reservoir caps that supply an instrument’s mobile phase. The result is easy to fill mobile phase bottles and safe, easy to empty waste containers.
As solvent is drawn out of the bottle (red upward arrows), a one-way check valve (top center) keeps vapor saturated air contained while allowing air to enter the bottle (blue downward arrow) balancing the pressures.
The check valve itself is protected by a barrier filter blocking dust and particulate contamination.
Color Coded cap kits easily identify your mobile phases.