The World's BEST O-Ring I.D. Measuring Tape
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Available in 3 different colors and sizes, O-Sizer Tape is a great tool for measuring AS568 and Metric O-Rings.

KEVN is a great tool to assist in differentiating between KNOWN O-Ring materials. Kalrez, EPDM, Viton and Nitrile are the 4 commonly used O-Ring rubber materials that can be identified by this tool.

Our O-Ring Size Selection Chart helps determine the correct AS568 dash number.