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Screw Cap With 0-Ring For T500 Internal Thread Tubes, Red - 1000/Case Made of polypropylene. Caps are available either with or without a silicone washer between the cap and the tube to ensure a positive leakproof seal at all temperatures. Closures and tubes are both manufactured of polypropylene, providing the same coefficient of expansion. The cap features a long skirt and a super-fast thread design allowing it to be removed or screwed on with a single turn. Autoclavable. Product photo may not exactly match the product offered for sale. Please refer to the product description.