With a WIGGENS Snorkel Stopper, you'll never again have to take time to open the stopcock and relieve pressure when vigorously shaking a separatory funnel,  because  our  Snorkel Stopper does the task automatically. When using a WIGGENS shaker, you can simply load the funnels onto it and get on with more important things without worrying about exploding glass. The Snorkel Stopper features a one-way check valve that automatically relieves gas pressure. The non-sticking, ground-glass valve is backed with a stainless-steel spring and a Tefon® closure screw for maximum chemical resistance. The valve releases pressure of more than 1 pound and prevents direct air contact with the vessel.

The shape of the stopper allows manual or machine shaking and avoids solution leakage.     For manual shaking, the stopper is held in place by hand. On WIGGENS shakers, glassware holders automatically restrain the stopper.