005-25N Metric Nitrile O-Ring 5mm x 2.5mm - Ashley Power Ltd
10mm x 2.5mm O-Rings - Nitrile NBR Rubber
uxcell Nitrile Rubber O-Rings, 75mm OD 70mm ID 2.5mm Width, Metric Sealing Gasket, Pack of 10: Amazon.com: Industrial & Scientific
Nitrile Rubber O Ring 47mm OD 2.5mm Width Round Sealing Washer Sealing Gasket Ring Faucet O-Ring Black Pack of 50: Amazon.com: Tools & Home Improvement