347 Stainless Steel Alloy is used for valve and valve housing. High temperature silicone Nomex reinforced actuator diaphragm. 17-7 PH Stainless Steel actuator spring gives consistent pressure at high temperature, resists “relaxing” at temperature to 900F (483C). Nitronic 60 Stainless Steel is used for the valve seat, and valve bushing the same material used in the higher level gates for reliability and longevity. CNC Machined 304L 12mm thick weld flanges. Low Cost. 100% made is USA. Color anodized 6061-T651 aluminum actuator (Silver, Red, Blue, Purple, Black). Wastegates shipped with air fittings and stainless hardware. Flanges are an extra cost, they do not come with the wastegate unit.