O-Ring, Buna N, 23mm OD, PK100: Amazon.com: Industrial & Scientific
23mm x 5mm (33mm OD) Nitrile O-Rings – Totally Seals
Nitrile Rubber O Ring 23mm OD 3.5mm Width Round Sealing Washer Sealing Gasket Ring Faucet O-Ring Black Pack of 50: Amazon.com: Tools & Home Improvement
uxcell Nitrile Rubber O-Rings, 25mm OD 23mm ID 1mm Width, Metric Sealing Gasket, Pack of 100: Amazon.com: Industrial & Scientific
NBR O-ring 18 x 2.5mm (OD 23mm) 70 Shore A [100 Pieces] | Tameson.com
Amazon.com: uxcell Nitrile Rubber O-Rings, 23mm OD 17mm ID 3mm Width, Metric Sealing Gasket, Pack of 10 : Industrial & Scientific