The construction of a Squibb tank top includes a process that "cones" the top surface to a pitch of nearly 7-10 degrees. This coned shape sheds both water and snow; effectively keeping the top free of resting water. Many tank failures in the field are due to resting water rusting the tops out of the tanks – greatly reducing the life of the tank. Additionally, the coned shape provides added strength and is more structurally sound when compared to a flat tank top.