3100200 - Harris 355-2 Argon/CO2 Flowmeter Regulator CGA-580

Precision Flow for Perfect Welds

As a welder, you know that consistent shielding gas flow is critical to laying down a porosity-free bead. The Harris Model 355-2AR-580 Flowmeter Regulator gives you the visibility and control you need to trust your gas coverage completely. Unlike standard gauge regulators that only estimate flow based on pressure, this flowmeter uses a floating ball in a calibrated tube, giving you a direct, visual confirmation of exactly how much gas is going to your torch. Whether you are TIG welding aluminum with Argon or MIG welding steel with C25, this unit ensures you aren't wasting gas or starving your weld pool.

The first thing you'll notice is the sensitive needle valve. It allows for smooth, fingertip adjustments, so you can dial in your flow rate with precision—no more fighting with sticky knobs that jump from 10 to 40 CFH. The flow tube is dual-calibrated for both Argon and CO2, making it a versatile tool for shops that switch between processes. The tube itself is protected by a durable cover, so it can withstand the accidental bumps and knocks that happen in a busy garage or job site. The large 1.5-inch steel gauge clearly displays your cylinder pressure, so you always know when it's time for a swap.

Harris has built this unit to last. The solid brass body and bonnet feel substantial and are resistant to corrosion. The internal design protects the seat from dirt and debris, which means fewer leaks and a longer lifespan for your equipment. It is designed for vertical mounting on CGA-580 cylinders, keeping the flow tube straight for accurate readings. With a massive flow capacity of up to 140 SCFH, this regulator can handle everything from delicate precision work to high-amperage fabrication. Upgrade your setup with a regulator that works as hard as you do.