Your tank heater should be able to be interchanged between metal and plastic tanks. With the Allied Precision Guard, it can. Compatible with Allied Precision's floating and sinking de - icers, the Allied Precision Guard quickly attaches and expands the uses of your de - icer. There's no need to get a second de - icer or risk using your incumbent de - icer in a plastic tank. Get the Allied Precision Guard, and you're good to go. This guard may be used with either the floating de-icer or sinking de-icer and is specifically designed to protect a plastic tank. The guard is made of galvanzied wire and is assembled without the use of welding. The end result is a much stronger guard which is less affected by rust and corrosion. For rubber, plastic or structural foam tanks. Allied precision 88R, snap on guard for floater may be used with the floating, sinking, or 2 in 1 de-icers and is specially designed to protect rubber, plastic, or structural foam tanks.