- Practical Design: Made from durable material, this gas trigger is easy to operate, ensuring a smooth experience during use. - Wide Compatibility: Designed to fit models FS38, FS45, FS46, FS55, FS55R, and part number 4140-180-1500. This versatility makes it an excellent choice for various applications. - Safe and Damage-Free Operation: This tool is engineered to ensure safe usage without damaging the camshaft or camshaft lobes, providing peace of mind during maintenance. - Versatile Functionality: Not only does it compress valve springs and allow access to the holder for valve spring replacement, but it can also be switched to function as a rocker arm remover. This is ideal for tasks involving the removal of camshafts, rocker arms, and hydraulic lash adjusters in 7L and 4.7L engines. Use Scenarios: 1. Easily replace valve springs on your FS series engine without risking damage to critical components. 2. Simplify camshaft removal during engine rebuilds or repairs, ensuring a hassle-free experience. 3. Switch seamlessly between compressing valve springs and removing rocker arms, saving time and effort during maintenance tasks. This gas trigger stands out due to its combination of practicality, safety, and versatility, making it an essential tool for both DIY enthusiasts and professional mechanics.