18MM by 14MM STEM 4"Standard Diffuser Clear (2 Pack)

SCIENTIFIC GLASSWARE STEMS 12-172 18MM BY 14MM STEM STANDARD DIFFUSER CLEAR 5"

Jianuo 18mm by 14mm Stem Clear Scientic Glass Tube Adapter (5 inch)

Handmade Stained Water Bottle Gift for a Friend Bowl (14mm)

Skull Crown Glass Herb Holder Smoking Bowl (14mm Male Clear Yellow Crown)

SCIENTIFIC GLASSWARE STEMS 12-173 18MM BY 14MM STEM STANDARD DIFFUSER CLEAR 5.5"

Jianuo 18mm by 14mm Stem Clear Scientic Glass Tube Adapter (3 inch)

Snake Eyebrow Copper Fish 2 Pcak Handmade Holder Glass Herb Bowl Blue & Green (14mm)

Dobene Stem 18MM by 14MM Standard Diffuser Clear 5"(4 Pack)