Large Inventory Natural Rubber and Latex-Free Rubber Custom Jobs and Custom Materials Six Sizes: S0511, S0713, S1020, S1320, S1530 and S2440 We also offer smaller, latex-free sleeve stoppers for use with IV Systems
The first two digits refer to the plug diameter and the last two digits refer to the sleeve diameter. The sleeve pulls over the neck of the bottle with the central area of the stopper being depressed within 1ml of the top to permit the insertion of a syringe needle. the puncture is self-sealing to permit the use of the entire contents.