Turbosmart ProGate50 (50mm) External Wastegates are designed for ultimate performance and durability. Turbosmart has specifically developed the Gen4 WG50 Valve Seat for their external wastegate range. The valve seat ensures a tight seal and improved response, even under high boost pressures, giving you complete control over your vehicle's turbo system. It's easy to install and will ensure your Turbosmart ProGate50 (50mm) External Wastegate performs optimally. Get the Turbosmart Gen4 WG50 Valve Seat today and take your turbo system to the next level! Make Turbosmart part of your engine setup today! Valve Seat - Suit Turbosmart Pro-Gate50 (50mm) External Wastegates. Suit Turbosmart Pro-Gate50 (50mm) External Wastegates. Valve Seat is only suitable for Gen 4 Wastegates only. Universal