Coralife Luft Pump

*High pressure air pump great for large or multiple aquariums*Adjustable rheostat controls airflow to suit your aquarium needs*Use to oxygenate water and improve gas exchangeThe Luft Pump delivers 7.0 p.s.i. against water pressure, making it an excellent choice for ponds. Its heavy rubber diaphragm cannot be damaged by back pressure; this means if an airstone has not been maintained, the diaphragm won't be damaged. The adjustable rheostat increases air flow by regulating electricity, not by blocking air flow, allowing more efficient, economical performance. Can be used with multiple valves or T-connectors for multiple devices. Quiet operation. Includes replaceable airline filters and airline clamp. 6-3/4" x 3-1/2" x 3".Please click on "More Information" for instructions for replacing rubber diaphragm.Please note: Return of electrical equipment to Drs. Foster & Smith for exchange or refund is limited to 60 days from the date of purchase. Beyond 60 days, electrical equipment is covered b