Anjon Pond Ventilators keep a circular opening in the pond surface during freezing weather so harmful gases can escape and oxygen can enter — critical for overwintering koi and goldfish. The 100-Watt model handles most backyard ponds; the 300-Watt unit is built for larger ponds or harsher climates. Both float on the water and cycle on automatically as temperatures drop. Key Features Automatic temperature-controlled operation — runs only when needed Floats on the pond surface to keep a circular air hole open during freezing weather Allows harmful winter gases (CO₂ and ammonia) to escape and oxygen to enter Essential overwintering equipment for koi and goldfish ponds in freezing climates 100-Watt unit for standard backyard ponds; 300-Watt for larger ponds or harsh climates Specifications Specification 100-Watt 300-Watt Voltage 120 120 Cord Length 30' 30' Dimensions 7" x 7" 7" x 3.3" Shipping Weight 5.00 LBS 5.00 LBS
