Rolair 4090K17 Air Compressor Pump With Flywheel

Rolair 4090K17 is a K‑Series single‑stage air compressor pump with a K17 head and an 11‑inch aluminum flywheel, designed as a replacement pump for Rolair’s 4090‑class machines. It is rated for drive configurations in the 1.5–3 HP range, aligning with the horsepower options commonly used on Rolair’s heavy‑duty gas units. The pump features an 11" multi‑fin flywheel for smooth startup and reliable displacement, and it carries a 34 oz pump oil capacity with Rolair’s synthetic compressor oil pre‑fill for easy starts and long service life. As part of Rolair’s K‑Series, this head is intended for use with Rolair’s 4090HK17 family of compressors (the suffix H17 indicates a K17 pump), offering a direct, single‑stage displacement suitable for framing, roofing, and other demanding tasks. Typical pump speed is around 1,740 RPM, helping match engine torque to air output for consistent performance.