Porter-Cable PCFP02040R 1.1 HP 4 Gallon Oil-Lube Twinstack Air Compressor (Certified Refurbished) This Certified Refurbished product has been tested and certified to work and look like new, with minimal to no signs of wear, by a specialized third-party seller approved by Amazon. The product is backed by a minimum 90-day warranty, and may arrive in a generic brown or white box. Accessories may be generic and not directly from the manufacturer. 1.1 HP induction motor with a cold start valve for fast and easy starts Oil-lubricated pump delivering 3.4 SCFM @ 90 PSI to support multiple tools 135 PSI max working pressure for breakaway tool performance Upgraded industrial quality pressure switch and regulator for efficient operation