![R-11 O-Ring (ID: 16 mm, CS: 2.5 mm, OD: 21 mm) (10 to 120 O-Rings) by X1 Tools: Amazon.com: Industrial & Scientific R-11 O-Ring (ID: 16 mm, CS: 2.5 mm, OD: 21 mm) (10 to 120 O-Rings) by X1 Tools: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/31eO3kX6HWL._AC_UF1000,1000_QL80_.jpg)
R-11 O-Ring (ID: 16 mm, CS: 2.5 mm, OD: 21 mm) (10 to 120 O-Rings) by X1 Tools: Amazon.com: Industrial & Scientific
![O-Rings Nitrile Rubber 29mm Inner Diameter 34mm OD 2.5mm Width Round Seal Gasket 25Pcs - Walmart.com O-Rings Nitrile Rubber 29mm Inner Diameter 34mm OD 2.5mm Width Round Seal Gasket 25Pcs - Walmart.com](https://i5.walmartimages.com/seo/O-Rings-Nitrile-Rubber-29mm-Inner-Diameter-34mm-OD-2-5mm-Width-Round-Seal-Gasket-25Pcs_9b5e2b6a-a692-4c8e-ad40-c5fa8f39b9c9_1.a54aeb1876fce1bb65c7fee4da1d5f8d.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
O-Rings Nitrile Rubber 29mm Inner Diameter 34mm OD 2.5mm Width Round Seal Gasket 25Pcs - Walmart.com
![Ideal Vacuum | ISO 63 One Sided Centering Ring Stainless Steel with Viton O- Ring, NW-63 Vacuum Flange Size, Typically Used With 2.5 Inch O.D. (63.50 mm) Tubing Ideal Vacuum | ISO 63 One Sided Centering Ring Stainless Steel with Viton O- Ring, NW-63 Vacuum Flange Size, Typically Used With 2.5 Inch O.D. (63.50 mm) Tubing](https://www.idealvac.com/files/images/Centering-Ring--One-Sided-O-Ring_01.jpg)
Ideal Vacuum | ISO 63 One Sided Centering Ring Stainless Steel with Viton O- Ring, NW-63 Vacuum Flange Size, Typically Used With 2.5 Inch O.D. (63.50 mm) Tubing
![uxcell Nitrile Rubber O-Rings 5mm OD 2mm ID 1.5mm Width, Metric Sealing Gasket for Automotive Machine Plumbing, Pack of 50: Amazon.com: Industrial & Scientific uxcell Nitrile Rubber O-Rings 5mm OD 2mm ID 1.5mm Width, Metric Sealing Gasket for Automotive Machine Plumbing, Pack of 50: Amazon.com: Industrial & Scientific](https://m.media-amazon.com/images/I/61sG1U4Z4QL.jpg)
uxcell Nitrile Rubber O-Rings 5mm OD 2mm ID 1.5mm Width, Metric Sealing Gasket for Automotive Machine Plumbing, Pack of 50: Amazon.com: Industrial & Scientific
![OSK™ Metric O-Ring Kit 350pc 18 Sizes 3mm-20mm ID X 2.5mm Cross Section [K350X18N70-2.50MM] : The O-Ring Store LLC, We make getting O-Rings easy! OSK™ Metric O-Ring Kit 350pc 18 Sizes 3mm-20mm ID X 2.5mm Cross Section [K350X18N70-2.50MM] : The O-Ring Store LLC, We make getting O-Rings easy!](https://www.theoringstore.com/store/images/k350x18n70-2.50mm.jpg)