Ultra Silent: Dual housing structure for sound insulation; 4 rubber feet
attached to the bottom to minimize vibration.
Powerful: Total output 250 GPH, 10W; capable of producing sufficient air to
run multiple air stones, sponge filters, bubble bars, air discs, an under
gravel system or hydroponic growing system.
Adjustable Air Flow: An easy-to-access control knob on the cord.
Dimension: 6 x 5.5 x 4 inches (L x W x H); the quietness and the power make it
a perfect choice for large tanks, multiple aquariums, and living room fish
tank.（Note: This air pump is much more powerful than regular air pumps, and
some ordinary check valves can't stand the air flow and make whistling sound.
In this case, you can remove the check valve and place the air pump higher than
the water level.)
Package includes: 1 x Air Pump, 2 x 2-outlet Gang Valves (easy to individually
adjust air flow to different tanks.)