Your P/N AP3994756 does it look like original or does it look like the picture to the right?
SPARKY257 for Model Number PDW9280N20SS
Answer Hello Sparky257. This is a cap assembly that comes with Three parts. It includes everything in the picture a cap and lock nut with white seal. Looks like this part might have been redesigned by the manufacturer and now they provide it as an entire assembly. Hope this helps.