I purchased this on Amazon a week ago and realized when it arrived it was the wrong one. So I said “well I’ll just return it.” NOPE. This item can‘t be returned because it contains a gas for safety reasons. But they shipped it to me.… Anyways I’m selling it for less than I paid for it. $60 Firm .Brand new in the box. I paid $71 after taxes. I’m just trying to get some of my money back. It fits model numbers MD3183, MD3184, MD3188.