14mm stopper for pass through adapters, 3 joint beakers or WP like the Sneaky Pete Cube. Please note whether you need a male or female
Approximately 2-3 inches total length
I purchased a 14mm glass trident splitter for my bubblers, so with one or two glass carb stoppers like these from RWW, I can have one or two vapes at once with one joint as a pass through. Nice! I also love all these glass duhickies! These stoppers are longer than I thought they'd be, and are thus easy to remove when I want to clear my bong.