Silicone Bung - #6.5 Dual Hole Stopper

The #6.5 Silicone Bung is more durable than a standard rubber bung, and because it has two holes it can be used with an airlock, and to be used as a blow off tube. One hole is 3/8" (fits standard airlocks), and the other is 1/4". Use the 1/4" side as a blowoff tube!