Apollo Horticulture AH AP-8.5WX4 18-LPM Air Pump with 4 Outlets 1  Apollo Horticulture 8.5W 4 Outlet Air Pump Pump Specs  AC: 110-120V / 60 Hz / Pressure: 1.89 PSI Output: 18 LPM  285 GPH / Decibles: 21 Pump Dimensions: 5.50x 7x 3.50 Package Includes: 1  Apollo Horticulture Air Pump