#6 Solid Rubber Stoppers Lab Tapered Plug Corks Fits 1 1/32″ to 1 1/4″ ID Solid Plug with 1 Center Hole Also used as laboratory stoppers, these rubber plugs have good abrasion resistance. They’re tapered to fit a range of hole diameters. Trade Size: 6 Profile: Tapered Height: 1” Natural Rubber Maximum Temperature: -70 to 200F Durometer: 40A ASTM D 2000 / SAE J200 Classification: AA, BA MIL-R-3065 / SAE J-14 / MIL-STD-417 Classification: RS Generally Resistant To: Abrasion, Water, Moderate, Chemicals, Organic Acids, Alcohols, Ketones, and Aldehydes Seller Information: Order with Confidence: ✅ All merchandise is stocked in our California warehouse. Our fifth year on eBay with a 99.