This adapter is used with vacuum manifolds as port connections,designed to regulate input of gases or liquids into reaction systems.Has a #15 o-ring joint on one end,hose connection is at the opposite end. ● Material:Borosilicate glass ● Color:Clear ● Hose Connection:10mm、12mm ● O-Ring Joints:#15 ● Corrosion and chemical resistance ● Accessory:R3508-09 Replacement O-rings,V4707-09 Viton O-Ring