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

ESAB 21570 Water Hose Adapter Overview

The ESAB 21570 is a specialized brass adapter designed to facilitate connections between different standard hose fitting sizes in industrial welding environments. Specifically engineered for water and coolant applications, this fitting bridges the gap between B-Size (5/8"-18) and A-Size (3/8"-24) connections. The designation "W" typically indicates compatibility with water service lines, utilizing Left Hand (LH) threads which are standard for water and fuel gas connections to prevent cross-connection with oxygen or inert gas lines (which typically use Right Hand threads).

Constructed from high-quality brass, this adapter offers excellent resistance to corrosion and mechanical wear, ensuring a long service life even in demanding shop environments. It is an essential component for welders needing to adapt TIG or MIG water-cooled torch lines to different water coolers or extension hoses. The precision machining ensures a tight, leak-proof seal when used with appropriate seating surfaces.

Technical Specifications

The adapter features a B-Size thread on one side and an A-Size thread on the other. In the context of welding fittings, "B-Size" refers to the standard 5/8-inch 18 UNF thread, while "A-Size" refers to the smaller 3/8-inch 24 UNF thread. The "518ID" reference in some catalog descriptions likely alludes to the 5/8" dimension or a specific hose internal diameter compatibility when used with barbed fittings, though this part itself is a threaded adapter.

• Material: Solid Brass
• Thread Type: Left Hand (LH) for Water/Fuel
• Primary Connection: 5/8"-18 (B-Size)
• Secondary Connection: 3/8"-24 (A-Size)