Available in either 7mm or 10mm O.D., both 4mm thick. 1-42 is for 5037 electrode adapter, the 1-48 is ideal for the Code 5029, #7 Ace-Thred bushing. These septa reseal easily. O.D., mm Thickness, mm Qty Order Code 7 4 Pkg/12 1-42 10 4 Pkg/12 1-48 A ce Glass offers a full line of caps, closures, seals and septa. This new brochure