27mm x 33mm x 3mm O-Ring (5 pieces): Amazon.com: Industrial & Scientific
uxcell Nitrile Rubber O-Rings, 6mm OD 3mm ID 1.5mm Width, Metric Buna-N Sealing Gasket, Pack of 20: Amazon.com: Industrial & Scientific
Amazon.com: uxcell Nitrile Rubber O-Rings 16mm OD 10mm ID 3mm Width, Metric Buna-N Sealing Gasket, Pack of 50 : Industrial & Scientific
uxcell Silicone O-Rings, 3mm OD 1mm ID 1mm Width VMQ Seal Gasket for Compressor Valves Pipe Repair, White, Pack of 10: Amazon.com: Industrial & Scientific
30mm x 36mm x 3mm O-Ring (5 pieces): Amazon.com: Industrial & Scientific