Best Value Outdoor Pond Air Pump Includes Complete Air Pump Accessories KitThis super-value air pump is weatherproof and can be run outdoors. Perfect for a small pond up to 4,300 litres (3,300 if keeping fish and 1,700 if keeping koi). If you are keeping fish this pump would be suitable for a It will deliver a reliable jet of air up to 600 litres per hour. The pump comes equipped with all of the accessories you need to get started - including fittings, hose and air stones. Unlike the 210 and 450 this 600 model comes complete with a 2-way chrome manifold which allows you to control the air flow from your pump.