Metal end caps, metal center tube, and in applications with a BPV, no combo valve in what my application shows as different between Classic & ecore. The classic BPV in my application is "clicker"style though.
"No matter how paranoid you are you're not paranoid enough. Tell the truth. Reach as many people as you can with it. That's your weapon." - Susanne Modeski, aka "Holly" to The Lone Gunmen