17mm x 22mm x 2.5mm O-Ring (8 pieces): Amazon.com: Industrial & Scientific
AF174-08 - Aeroflow Buna N Rubber O-Ring -8AN 17mm ID x 21mm OD 10-Pack
FKM O-ring 12 x 2.5mm (OD 17mm) 80 Shore A [20 Pieces] | Tameson.com
Buna-N O-Ring - 1.8mm Wide x 17mm ID - Pack of 25
Amazon.co.jp: Othmro 0.2 inch (5 mm) Width 0.7 inch (17 mm) Inner Diameter 1.1 inch (27 mm) Outer Diameter 10 Pieces O-Ring Black Nitrile Rubber Ring Skeleton Oil Seal Ring Nitrile Rubber