Rob, i seen your post on the smart vales from AC. THANK YOU very helpful, but i have one qeustion. In the article AC states that the smart values should lay flat on the bottom of the tank. today i went to check that, so i stuck my hand into the tank and reached back and the smart v was not laying on the bottom of the tank it was floating in the gas, is this what its supposed to do. is this ok. it was flat, it just wasent flat on the bottom of the tank like they stated. thanks for any help. <_<