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Transparent Acrylic Hard Tube Pipe OD 8mm 10mm 12mm 14mm 16mm 18mm 20mm PMMA PC Water Cooling Rigid Tube 50cm Length - AliExpress
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18MM Downstem | Buy an 18MM Diffused Downstem for Water Pipes and Bongs - Thick Ass Glass
14mm to 18mm 12-Slit Glass Downstem – Purr Glass
Acrylic Pipe Clear Rigid Round Tube 14mm ID 18mm OD 14" for Lamps and Lanterns, Water Cooling System 2pcs - Walmart.com
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Glass Pre-Roll Tubes: 18mm, 115mm, 400 Count
18MM Downstem | Buy an 18MM Diffused Downstem for Water Pipes and Bongs - Thick Ass Glass
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5pcs High borosilicate glass tube,Outer diameter 14mm,L. 100mm/200mm/250mm/300mm,High temperature resistant glass tube - AliExpress
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![3" 3.5" 4" 4.5" 19mm / 18mm to 14mm Glass Downstem 5-Arm Tree Barrel Tube 15-Cut | eBay](https://i.ebayimg.com/images/g/sgQAAOSwkQFkQrPJ/s-l1200.jpg "3" 3.5" 4" 4.5" 19mm / 18mm to 14mm Glass Downstem 5-Arm Tree Barrel Tube 15-Cut | eBay")
3" 3.5" 4" 4.5" 19mm / 18mm to 14mm Glass Downstem 5-Arm Tree Barrel Tube 15-Cut | eBay
