This Glass Bong Pre 'Cooler' from 'Black Leaf' has 2x SG 19 (18,8mm) fittings, to connect your Bong adapter, using either: SG 19 or SG 14 to attach the conical glass bowl, which has a coloured, pimple, to prevent rolling, roll-stop.
SG 19 (18,8mm)
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