Die cast aluminum pump with cast iron sleeve (oilless) Compact design very lightweight Direct drive Oilless pump has sealed bearings on all reciprocating parts and Teflon-impregnated piston rings to reduce friction Manual reset overload protection
found in 92111's description:From the Manufacturer
This Palmgren DIY Series AirCompressor is perfect for the at-home hobbyist or for contractors who need a portable pneumatic power source, and it is oilless for maintenance-free operation. Compressor consists of a 1HP motor, single cylinder, single stage aluminum aircompressor pump and a 1 gallon air tank. The pump runs very quietly, so that the compressor can be used in the same area that the work is taking place. Compressor is light weight and portable.