The 7CFM vacuum pump is ideal for obtaining a vacuum by pumping the gases out of a sealed container, especially suitable for household air conditioning, automobile maintenance, vacuum packaging, and refrigerator vacuum. The vacuum chamber is made of high-strength 304 stainless steel with a 5 gallon capacity. The easy-to-read vacuum gauge can help you accurately monitor the vacuum level in the chamber. The chamber comes with two silencers, which can reduce vibration and noise, thus running more quietly.