https://aggstrom.com/product/borosil-4331-lids-for-reaction-flask-flat-flange-and-interchangeable-joint/
Borosil 4331 Lids for Reaction Flask - Flat Flange and Interchangeable Joint - Aggstrom
Apr 27, 2021 - Joint Size 19/26-19/26-24/19-19/26 19/26-14/23-14/23-14/23 29/32-14/23-14/23-14/23
reaction flaskborosillidsflatflange
https://www.parma.kr/product-page/ace-glass-6488-40-four-necks-reaction-flask-head-45-50
Ace Glass 6488-40 Four Necks Reaction Flask Head, 45/50 | PARMA
Ace Glass 6488-40 Four Necks Reaction Flask Head, 45/50Part # 6488-40 Four Necks Head, 45/504-Inch Conical Flange, 4 NecksStandard 4-inch (100mm) head for use...
reaction flaskaceglassfournecks