Heavy gauge, stainless steel bracket secures heater to bucket. Security chain snaps on fence and prevents heater cord from being pulled into dog run. Copper sheath protects cord from chewing. Works in all bucket types – metal, plastic and rubber, up to 5-gallon capacity. This unit is designed to keep ice out of a single bucket. If you’re tired of breaking ice, your worries are over – no matter how cold it gets! This unit out performs all comers!