1Application: Valve spring compressor tool and air valve holder pressure pipe kit is suitable for LS1 LS2 LS3 LS6 engine. Replacement for Lsx, Replacement for Cts V, etc. 2High Strength: This tool kit is made of durable metal and rubber, ensuring long lasting performance and reliability, ensure that it can withstand long term heavy use. 3Efficient: This tool is used when installing valve springs while the cylinder head is installed on the engine. This tool allows the combustion cylinder to be filled with compressed air, which holds the valve closed while the valve spring is exchanged. 4Accurate Results: This valve spring compressor tool maintains the structural integrity of the valve spring during compression, allowing for accurate and safe component installation. 5Easy to Use: It is designed to be easy to use. The Ls valve spring compressor tool does not require complicated operation and is suitable for professional auto mechanics and Diy enthusiasts.