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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
![2 sets Remington O-Ring Barrel Seals for 1100 20 GA, 11-87 20 Gauge - All Models STD/LT/LW/SP - Walmart.com 2 sets Remington O-Ring Barrel Seals for 1100 20 GA, 11-87 20 Gauge - All Models STD/LT/LW/SP - Walmart.com](https://i5.walmartimages.com/asr/460d4356-daea-4e4b-9c2d-96a206f62a5c.0d4b2b66a14abc5b76031a82fbf4e828.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
2 sets Remington O-Ring Barrel Seals for 1100 20 GA, 11-87 20 Gauge - All Models STD/LT/LW/SP - Walmart.com
![2 sets Remington O-Ring Barrel Seals for 1100 20 GA, 11-87 20 Gauge - All Models STD/LT/LW/SP - Walmart.com 2 sets Remington O-Ring Barrel Seals for 1100 20 GA, 11-87 20 Gauge - All Models STD/LT/LW/SP - Walmart.com](https://i5.walmartimages.com/asr/8006fa0e-ac25-4783-b7db-60a1480f980a.2d52b770ca8aeebcc177612c149ff619.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
2 sets Remington O-Ring Barrel Seals for 1100 20 GA, 11-87 20 Gauge - All Models STD/LT/LW/SP - Walmart.com
![5PCS Fluorine rubber Ring Brown FKM O ring Seal CS:3.1mm OD10/11/12/13/14/15/16/17/18/19/20mm Rubber ORing Seal OilRing Gasket - AliExpress 5PCS Fluorine rubber Ring Brown FKM O ring Seal CS:3.1mm OD10/11/12/13/14/15/16/17/18/19/20mm Rubber ORing Seal OilRing Gasket - AliExpress](https://ae01.alicdn.com/kf/HTB1qZQCacfrK1RjSszcq6xGGFXa8/5PCS-Fluorine-rubber-Ring-Brown-FKM-O-ring-Seal-CS-3-1mm-OD10-11-12-13.jpg)
5PCS Fluorine rubber Ring Brown FKM O ring Seal CS:3.1mm OD10/11/12/13/14/15/16/17/18/19/20mm Rubber ORing Seal OilRing Gasket - AliExpress
![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/61XdyWwsbgL._AC_UF350,350_QL80_.jpg)