Weatherproof pond oxygenator able to generate 4,800 litres per hour. Super quality at a bargain price - we even include the fittings you need (airline, air stones, manifold) to connect everything up. This is a solid, reliable and quiet pond air pump. It will operate outdoors in all conditions providing essential additional oxygen to your pond. This pump will sufficiently aerate ponds with a volume of up to 34,000 litres (26,400 if keeping fish and 13,200 if keeping koi).