Found 2 3D-models for “18mm downstem” across many websites

#bubbler#pipe#downstem#weed#bong#18mm#jar#waterpipe#420#mason jar
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Water Bong, threaded 14mm downstem

Water Bong, threaded 14mm downstem

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JarJarBongTop -- Water Pipe Mason Jar Top

JarJarBongTop -- Water Pipe Mason Jar Top

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