Sweetwater SL44 Linear Air Pump. **** Sweetwater Linear Pumps - Flow Curves **** These are not linear "diaphragm," but true linear "piston" type pumps. Since the only moving part - the piston - floats on a bed of air, an exceptionally long service life can be expected (8 years of continuous life is not uncommon). You get quiet, energy-efficient operation and clean, oil-free air. An outdoor-rated housing, grounded power cord, 1/2" MNPT flex outlet and 115V/60 Hz are all standard. UL-listed. 1-year warranty. SL-44 Specifications: * 100" max depth * Dimensions: 11" x 8" x 8" * Power Consumption: 92 running watts. * Output: 2.3 cfm of output at 2 psi.