Size 1 Green Neoprene Rubber Stoppers are Tapered Rubber Stoppers that will plug bottles, lab vials and other openings. Manufactured from Neoprene Rubber. Neoprene Rubber is suitable to a temperature of 275 degrees F and suitable for use with petroleum products, minerals, oils and fats.
Green neoprene rubber stoppers
Have only used this one .... and so far, it is perfect! Could not use my hollow paddle board with the hole unplugged and the original stopper simply disappeared. This is working perfectly and I'm back in paddling.