HRF 2400 series regulator/flowmeter combination are specially designed for MIG, TIG, and other inert gas welding applications. Regulator / flow meter combination in one compact unit. MIG / TIG applications. Ideal for all applications where dependability is needed. Calibrated tube at 25 psig (not on HRF 2480). Machined brass body & housing cap. Back pressure compensated. Fabric reinforced neoprene diaphragm. Internal self reseating relief valve – not designed to protect downstream equipment. Sintered inlet filter – bronze. Cover tube contains overpressure protection.