It is an OEM item which is made for use with Krups espresso makers. This component provides an air-tight seal for the piston. Over time the material will wear out and it may begin to crack eventually requiring a replacement to ensure the unit functions properly. To ensure the correct installation of the new part, refer to the specific dia...Read moregrams of your model. It is a high-quality seal which is made of durable rubber material and is sold as an individual component. You will need a screwdriver to take the housing apart when performing this repair.