【FUNCTION】-Fit for pcp Air compressor piston and rods 【HIGH QUALITY】-Stable performance, long service life. 【MATERIAL】-Made of high quality Aluminum and Brass, corrosion resisting and anti-aging. 【EASY to USE 】-Compact structure, easy to install and use. 【APPLICATION】-Applicable for most of piston type air compressors.Make sure that you pick up the right size and use it peoperly.No complicated installation steps, you can easily use it to complete your work.