4mm x 8mm x 2mm O-Ring (10 pieces): Amazon.com: Industrial & Scientific
uxcell Nitrile Rubber O-Rings 15mm OD 8mm ID 3.5mm Width, Metric Sealing Gasket, Pack of 10: Amazon.com: Industrial & Scientific
Amazon.co.jp: DyniLao Nitrile Rubber O-Ring 11.8mm OD 8mm ID 1.9mm Wide, Metric Buna-N Sealing Gasket, Pack of 30 : DIY, Tools & Garden
Amazon.co.jp: uxcell Rubber O-Ring Rubber Black 20 Pieces 8mm x 5mm x 1.5mm : DIY, Tools & Garden
Amazon.co.jp: Oリング CS1.8mm NBRゴムの100pcs O RING ID 1.8 / 2 / 2.24 / 2.5 / 2.8 / 3.15 / 3.55 / 3.75 / 4x1.8mm和ニトリルガスケットシール厚さ1.8mmの論理和 ガスケット (Size : ID3.15x1.8mm) : 産業・研究開発用品
Amazon.co.jp: Seal CS1.8mm Silicone O RING ID 31.5. / 29/28/26.5/25.8*1.8mm Japanese VMQ Gasket Seal Thickness 100PCS White Red Rubber 1.8mm Size : ID30x1.8mm White) : Industrial & Scientific
Amazon.com: JUN-STORE O-Rings CS1.8mm Silicone O Ring ID 69/71/73/75/90/93.4/97.4x1.8mm O-Ring VMQ Gasket Seal Thickness 30PCS White Red Rubber 1.8mm ORing SENMIAO-TH (Size : ID71x1.8mm Red) : Industrial & Scientific