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KOOTANS 1200Pcs Nitrile Rubber O Ring Kit 24 Sizes O Rings Assortment Kit Set Sealing Washer NBR Metric o-Ring Assortment for Plumbing, Gas, Automotive and Faucet Repair, Resist Oil and Heat O-Rings:
4mm x 1mm Metric Nitrile O-Rings (Pack of 100): Amazon.co.uk: DIY & Tools