Neoprene Stopper, 1 Hole - Blue, Size: 40mm Bottom, 49mm Top, 40mm Length - Pack of 10

This pack of 10 neoprene rubber stoppers features a single hole measuring 5mm in diameter. Each stopper is blue, measuring 40mm in length with a base diameter of 40mm and a top diameter of 49mm. The neoprene rubber construction is suitable for use with petroleum products, minerals, oils, fats, and most inorganic acids and bases. Temperature resistance ranges from -40°C to 130°C. This larger stopper size is appropriate for wide-neck flasks and bottles requiring a single-hole stopper for tubing or thermometer insertion.