I just bought a pack of these. First time I ever had one in my hand . The instruction packet talks about a red compression ring that goes over the cup. There not in the package. Actually for those who have purchased these, do these rings come, say in separate plastic bag within the main package, or are they already in place around the cup? I ask this because I looked directly at the head when I opened them, and there was no ring, but if they came in a separate packing, I could certainly have dropped it. Thanks....