18.8 to 14.4mm adapter
thingiverse
Print both parts separately. Tape them together securely using masking tape. Mix up two-component platinum silicone, following the manufacturer's instructions. Either pour the mixture into a mold and shake it gently to remove air bubbles or inject it with a syringe for a more precise application. Allow the silicone to cure completely, according to its recommended setting time. Remove the tape carefully and position the lower part securely in a vice. Gently turn the upper part until the silicone yields slightly, then lift it off. Insert the assembled piece into an 18.8mm waterpipe or lab glass for use.
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