Tom Rapids Dive Power 40 

Powerful and durable, fully adjustable flow diffuser with venturi feature. Can be used alone in the aquarium to agitate water surface and increase gas exchange or by adding a Dive Power Head to an undergravel filter which will improve filtration by moving more water through the gravel, oxygenates the water and improves biological capabilities. 

Tapered riser adapter fits all undergravel filters. 
Adjustable hanger bracket (for 85, 125 & 200) 
Stay-Stick silicon suction cups 
Epoxy sealed motor 
Air filter 
Flow diffuser (except Model: 40) 
Specifications: 
Wattage: 3.7W 
Flow Rate: 40gph 
Max Height: 1.9ft 
Voltage: 115V 
Amperage: 0.06mA 
Recommended Aquarium Size: 10gals 
Dimensions: 1 1/2" x 2 3/8" x 2 1/4"