The old factory gasket had seen better days and was letting oil escape. Put the new one on and haven't had to wipe oil residue off the valve cover yet!

Purchased two of these as a part of a oil breather system re-seal and rebuild. One was for the oil filler cap and the other for the assembly spout attachment part on the valve cover assembly. I am very happy with the performance of both parts they hold and seal the oil in place and both were very easy to install. Rein offers suitable products and a very good price.