Yes I believe you are right. If you look closely at the photo in the link you provided you can see the valve on the paperwork inside the bottle and underneath the word insta-valve on the pink paper next to the bottle. Good ID RelicHunter97.RelicHunter97 said:I think it is more along the lines of this:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=360312515737
Put in a baby's bottle, supposedly to prevent colic.