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This handy silicone plug can be used to plug your bong's ground joint, so you can effectively clean your waterpipe without splashing water or cleaner everywhere.
Pop the plug inside the ground joint, fill with hot water and shake your pipe vigorously to remove tar and other detritus from the glass.
This silicone plug can also be used to plug a carb hole or kick hole.
Available in 14.5mm and 18.8mm see dropdown menu.