Miller® Heavy Duty 2 Stage Argon and CO2 Flowmeter Regulator, CGA 580/CGA 320Miller Argon CO2 flowmeter regulator, 80 PSIG Rugged heavy duty industrial grade regulators provide efficient and accurate regulation, and include our exclusive self centering flowball. They are constructed with our exclusive Sure Seat filtered seat technology for extended seat and regulator life. Filtered seats prevent contamination from entering the seating area, reducing repair costs and downtime. Filtered seats also reduce CO2 freeze up. Provides