from what I see there is no clamp on it. personally I dont like using gumout or heet in my cars, they always break stuff loose and clog something ( which what they are supossed to do). My buddy used to use heet all the time to get rid of any water in the tank but did not realise the how heet works , it collectes all the water in the tank into a gel and then sinks into the bottom of his tank, when the gas gets low the pump would suck it up. and also while is sites in your tank it will cause rust to form on the bottom.