This is for a new old stock genuine Mercedes monovalve. I will also send images via messages of a rare old information sheet about these monovalves which includes a diagram of how everything stacks together. A wavy washer is not included. Just re-use yours. The key markings to distinguish a genuine OE Mercedes monovalve from an aftermarket is the genuine ones have raised letters and numbers on the thin edge of the rubber, especially the letters "MB" as shown. Free shipping in the U.S. If there's a problem let me know and I'll work with you. My work keeps me away often so to be safe, handling time to get this shipped out is 1 week. SHIPPING ADDRESS: I can only send your item to the registered shipping address at time of payment.