This powerful vacuum pump provides a great value, with the added ability of acting as a compressor when the exhaust port is used (instead of the intake). This pump is a great choice for most hobbies and other light-duty applications. For use with air or other inert gases; not designed for flammable gases or liquids. Barb Size (in.): 1/4 Max Continuous Usage (hours): 5 Expected Lifetime (hours): 500 Visit us at: www.focalflux.com