UNS at Underwater TropicsTank guideStand guideUNS gear Ultum Nature Systems · Tallahassee, FL UNS Pro CO₂ Tubing, Clear 6 in stock Call the Tallahassee shop Clear, flexible tubing for running a pressurized aquarium CO₂ line from the regulator to a diffuser. Comes on a 3 m (9.84 ft) roll.Measure the fittings before cutting. Use pressure-rated CO₂ tubing on a pressurized CO₂ line and check the connections for leaks.Related gear CO₂ check valve · 24 oz CO₂ cylinder & regulator kit · Browse CO₂ gear