Tough, flexible rubber construction Repairs single-handle faucets Designed to be used on Delta kitchen faucet spouts Designed to withstand harsh chemicals High abrasive resistance and temperature resistance Eliminates leaks at the base of a spout Complies with the reduction of lead in drinking water act Will withstand heat between a temperature range of 86°F to 248°F (-30°C to 120°C) Helps save water and energy