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Valve Seat Assembly (Replacement Parts For Cutting & Welding Outfit - Acetylene/ Oxygen Regulator) A pressure regulator is a valve that controls the pressure of a fluid or gas to a desired value. Regulators are used for gases and liquids, and can be an integral device with a pressure setting, a restrictor and a sensor all in the one body, or consist of a separate pressure sensor, controller and flow valve. ✔️Material: Brass Refer measurement on picture. Also available: ✔️Diaphragm ✔️Oxygen Regulator ✔️Acetylene Regulator ✔️ Outlet Connector ✔️Head Mixer ✔️Victor Nozzle Gasket If you need replacement parts or accessories for your primary or secondary regulator, we've likely got what you're looking for. If you need a part that is not listed below, feel free to contact us and we'll help you find what you need.