External tube for flowmeter tube is a component that serves as an external cover for the flowmeter tube in pressure regulators. It is a component designed for the new model of pressure regulators with a swivel nut, which allows the flowmeter tube to be securely and stably attached. This tube plays a protective role, while ensuring adequate durability and functionality of the system. Its main task is to enable precise monitoring of gas flow in the system, which is crucial for the efficiency and safety of welding and cutting processes.