21570 - ESAB Water Hose Adapter B-Size Female to A-Size Male LH

Connect Your Cooling Lines with Confidence

When setting up a water-cooled TIG or MIG system, mismatched hose fittings can be a major headache. The ESAB 21570 Adapter is the problem-solver you need in your toolbox. Designed to convert between the two most common welding fitting sizes—B-Size (standard 5/8") and A-Size (smaller 3/8")—this brass fitting ensures you can get your coolant flowing without searching for a new hose assembly.

Why Brass?
In the welding world, durability is key. Plastic fittings can crack under heat or stress, and steel can rust when exposed to water coolants. This ESAB adapter is machined from solid brass, providing the perfect balance of strength and corrosion resistance. It stands up to the rigors of daily shop use and maintains a tight seal to keep your coolant where it belongs—inside the line, not on your floor.

Safety First
This adapter features Left Hand (LH) threads, which is the industry standard for water and fuel lines. This safety feature prevents you from accidentally connecting a water line to an inert gas or oxygen regulator, protecting both your equipment and your weld quality. Whether you are adapting a new torch to an older water cooler or extending your reach with different hose sizes, this adapter is a simple, effective solution.

Key Features

• Converts B-Size (5/8"-18) to A-Size (3/8"-24)
• Left-hand threads for water service safety
• Heavy-duty brass construction
• Essential for water-cooled torch setups