This unique pump has a double dampening system and noise absorption function that gives high performance with super silent running. The double flow bars produce a large quantity of air at a very high pressure. The pump also has a complete waterproof design so no need for any housing and hence always draws in clean air. Rated at 5.51 PSI Max pressure 4.23 CFM rated Exhaust Volume 120 LPM 125 watts 45 dB Noise level