The box it came in should say CMP on the outside, also it may have a CMP sticker on the firewall. I don't use the stock tanks on anything. Don't want to take it apart due to stiff tubing issues or stuck clunk. I use these tanks, they are great. No tubing on the inside of the tank.
http://www.jlproducts.net/ProductRotoFlow.html

The plane likes to float, you need to slow it down and make about a three wheel landing, if not it will bounce and you will need to go around.
good luck
FTIR