1. Compatible with Perfectly fits the AB9040019 compressor model, requiring no additional modifications or adjustments, plug-and-play for easy and quick installation. 2. Optimized piston ring design reduces friction and wear, improving the overall performance and efficiency of the compressor. 3. Fits Models: H27508UWK / A600006 . 4.Compatible with Multiple Brands Air Compressor Piston Cylinder.