Brand Compatibility: Fits American Standard, Vallet | Brand Name: Danco | Exterior Diameter: 51/64 in. | Interior Diameter: 41/64 in. | Material: Rubber | Number in Package: 1 pk | Packaging Type: Polybag | Shape: Round | Wall Thickness: 5/64 in. O-rings are one of the simplest, yet most engineered, precise, and useful seal designs ever developed. O-rings are available in various metric and inch standard sizes. Sizes are specified by the inside diameter and the cross section diameter (thickness). Danco o-rings will repair your leaky faucet and prevent future leaks. Faucets usually have one or more o-rings to prevent water from leaking out around the spout. Replacing worn-out o-rings is an inexpensive alternative to replacing the entire faucet fixture and is an easy DIY installation. Danco o-rings are high abrasive resistant and tempature resistant. Danco o-rings will withstand heat between a temperature range of 86Â °F to 248Â °F (-30Â °C to 120Â °C). These tough and pliable Buna-Nitrile Rubber (NBR) O-Rings will help provide long-term use for your plumbing needs. Danco o-rings are perfect for the everyday DIY'er or the Plumbing Professional. | Fits American Standard and Vallet | Provides a better seal which helps prevent leaks | For faucet repair