Pond One O2 Plus 4000 Air Pump Oxygen equals Life. This is all the more true in a garden pond. A well aerated garden pond will feature less algae, healthier fish and clearer water. Good pond aeration helps filtration processes, improves the water quality, prevents the pond from becoming stagnant and helps fish to breathe, particularly in warmer weather when the dissolved Oxygen in the water is even less. Features: High volume, high pressure pond air pump Enables connection of up to 10 air devices with the use of gang valve High grade, long life silicone parts Twin air filters supply clean air to the pond by removing dust and pollution Aids in circulation of dead water spots 10m outdoor rated cable Voltage: AC 220-240V / 50 Hz What's Included: 1x O2 Plus 4000 Air pump 10 outlet gang valve - [Uses Standard 4mm Aquarium Airline (Not included with air pump)] 1x Soft rubber elbow connector 2x Spring clamps 1x Instruction Manual Model Air Output (L/hr) Power Consumption (W) Maximum Pressure (MPa) Outlets O2 Plus 4000 2100 20 0.024 10 O2 Plus 8000 4200 47 0.038 10 O2 Plus 12000 6600 60 0.032 10