12-764 SCIENTIFIC LAB GLASSWARE STEM 18MM BY 18MM STEM WEEPHOLE PERC CLEAR 5"

Glass-100 18.8 mm Glass Bowl Male Glass Accessories

12-162 SCIENTIFIC GLASS 18MM BY 18MM DOWNSTEM STANDARD DIFFUSER CLEAR ASSORTED SIZES 3"

12-539 SCIENTIFIC GLASS 18MM BY 14MM DOWNSTEM STANDARD DIFFUSER CLEAR ASSORTED SIZES 4"

SCIENTIFIC SUPPLIES, 12-289 BOWL STANDARD AMBER 18MM

MFHX Handcrafted Glass items, replace bowl, male adapter, 14mm / 18mm (18mm, Blue)

12-173 SCIENTIFIC GLASS 18MM BY 14MM DOWNSTEM STANDARD DIFFUSER CLEAR ASSORTED SIZES 5.5"

ZLK 18mm Green Round Bowl (Green)