Sinking Tank De-IcerProduct Details UPC 022102015102 Manufacturer Part No 15N Bullet1 Operates at the bottom of the tank where it is less likely to be disturbed by livestock. Bullet2 Thermostatic control coupled with thermal feedback protects the unit from overheating. Key Features Operates at the bottom of the tank where it is less likely to be disturbed by livestock. Description Sinking De Icer 1500 Med White