We have 2 sizes for our bong parts – Standard & Bonza
Anything “Standard” will fit with other standard sized parts. “Bonza” will only fit with other bonza sized parts. (stems, cones, connectors, grommets & chambers)
Some chambers have Standard holes, some have Bonza holes and some will have one of each. Ensure that the top hole in the chamber suits the diameter of the stem you wish to fit. The size of the side hole on the chamber needs to match the diameter of your connector, and the diameter of the hole in your bong.
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If you need any further help with sizing, ask us on Live Chat!!