The double bung top pre-bent rigid delivery tube is unbreakable in normal use, and is an ideal substitute for fragile glass alternative. It is suitable for many types of gas collection experiments. 6mm OD fits 5mm stopper holes. PP. Dimensions (L x W x H): 10.125 x 0 x 6.675 inch. Shape: Double Bung. 5/Pack. Dynalon® #: 510864-0004.