Features a threaded side port for insertion of thermometer or bleed tubes with an outside diameter between 5–7.5mm.All sizes are hand-blown from tubing to ensure uniform wall thickness. ● Material:Borosilicate glass ● Color:Clear ● Heavy wall design,with nylon bushing and FETFE O-ring ● Two neck round bottom flask with taper outer joints ● High resistance to heat,chemical attack,and mechanical shock ● Accessories:C3507-02 13mm Compression Cap with Hole,R3508-01 #107 FETFE O-ring ● Joint size 24/40:24 refers to joint diameter,40 refers to joint height,other specifications and so forth