Champion R15B 5 – 7.5 HP 2 Stage Splash Lubricated Replacement Compressor Pump. Champion R15B (Replaces R15A) 5 – 7.5 HP Two Stage Splash Lubricated Compressors With Head Unloaders. This pump is designed for heavy-duty industrial applications. Die-cast aluminum cylinders with cast-iron sleeves for greater efficiency, cooling, and service life….