Having only one moving part, linear piston pumps offer quiet, low cost, long service life.These Medo model AC0502 pumps are rated at 1.69 CFM. They will easily supply air to 6 to 12 small (3/4" x 3/4" x 1-1/2") air stones or run multiple airlift pumps while drawing only 40 watts. The pumps have a 1/4" NPT output, fit with a brass connector for 1/8" ID tubing. This can be removed and fit with any 1/4" NPT fitting.

These compact, quiet (50dB) pumps are very reliable and often run 7 to 10 years continuously with out any problems. Manufacturers data is shown below. These refurbished pumps come with a 6 month warranty.

$49