Jenny has been producing this single-stage compressor pump for more than 40 years. The K-pump is available on 12 electric and four gas-powered Jenny wheeled-portable air compressors as well as service vehicles and compressor/generator models. Upgrades include new, patented easy-access unloader pins. An oil sight glass allows an operator to check the oil level within seconds. The patent-pending crankcase breather system features a replaceable filter and the cast-iron design enhances durability and resists potential abuse.