Ace Glass 12014-46 37mm OD Top x 22mm OD Bottom Neoprene Stopper Cone

37mm OD Top x 22mm OD Bottom Neoprene Stopper Cone

Pluro stoppers are nested rings cut from the same stopper and will give a vacuum tight fit for all openings within its size range. Black rubber is suitable for most applications from -40 to 150 degrees F. Silicone stoppers have a higher servicable temperature of -100 to 450 degrees F. The black neoprene cones differ in that thay are all the same size and are used primarily to support funnels. Color: Black.