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O-Ring Tapes, O-Ring Tape for measuring the inside diameters of o-rings and other soft walled parts, manufactured by Pi Tape Corporation - Newman Tools
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O-ring Gauge Make Work Smart Blue Telescoping O Ring Slide Measuring Id Gauge 13-1/2"long Extends To 23-1/2" O-ring Sizing Gauge - Oil Seals & Other Seals - AliExpress
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