if it is a full bottle, crack open the valve with it right side up and if it sprays liquid (i.e. frost on what ever you sprayed it on) than it has a tube...if it just blows a fine mist than it does not. Fip it over and do the same thing to double check it you want to make sure......If the BOSS kit was purchased for a snowmobile than it did not come with a siphon tube.