9-4090 - Tweco 10ft Hose Assembly, B-Size LH Fittings

Technical Overview of the Tweco 9-4090 Hose Assembly

The Tweco 9-4090 is a specialized hose assembly designed for integration into industrial welding environments, specifically within inert gas welding systems such as MIG (GMAW) and TIG (GTAW). This assembly features a 10-foot length, providing sufficient reach for standard workstation layouts while minimizing pressure drop associated with excessive hose lengths. The hose is terminated with B-Size (5/8"-18) Left Hand (LH) fittings. In the context of inert gas welding equipment, Left Hand threads are universally used for water/coolant lines (and fuel gases) to mechanically prevent accidental connection to Right Hand shielding gas regulators or outlets, ensuring operator safety and equipment integrity.

Manufactured by ESAB under the Tweco brand, this hose assembly utilizes high-quality synthetic rubber materials reinforced to withstand the rigors of shop environments, including exposure to heat, sparks, and abrasion. The fittings are professionally crimped using heavy-duty ferrules (indicated by the 'F4' designation in some nomenclature), guaranteeing a secure, leak-free seal under standard operating pressures. This component is essential for maintaining the cooling loop in water-cooled torches or for specific fuel gas applications where B-size LH fittings are required. It serves as a direct replacement for worn or damaged lines, restoring full functionality to the welding system.

Proper maintenance of fluid delivery lines is critical for weld quality and equipment longevity. The 9-4090 ensures consistent flow rates and secure attachment, mitigating risks of coolant leaks that could damage the torch head or contaminate the weld zone. Its standardized fittings make it compatible with a wide range of industry-standard power sources, water coolers, and wire feeders that utilize the CGA 'B' size connection standard.