This high-pressure oxygen valve seat repair kit (part 0390-0043) is designed for Victor cutting torches including CA411-1, CA350, CA1060, CA1050, ST900FC, HC1100C, and most straight torches (excluding CST800, HC1500, HC3900, and HC1400). The kit contains the essential internal parts needed to rebuild the high-pressure oxygen valve and restore proper sealing and flow. Worn valve components can cause oxygen leakage, unstable cutting action, and difficulty maintaining a clean oxygen jet. Replacing these parts helps restore safe, efficient cutting performance. Ideal for shop maintenance, torch repair facilities, and industrial welding environments.