American Standard 4356.100.021 Air Gap, Bone American Standard 4356.100.021 Air Gap, Bone Features: • Strong and durable • Finish will not scratch, tarnish or peel, and will last a lifetime • Will mount on surfaces up to 2"" thick • Great option for those thicker solid surface countertops • Coordinates with kitchen faucets and accessories • Meets the IAPMO code requirements"