9-4643 - Tweco Male Quick Disconnect Nipple for Water Supply

Industrial Grade Coolant Supply Fitting

The Tweco 9-4643 is a Male Quick Disconnect (QD) fitting specifically designed for the coolant supply lines of water-cooled welding equipment. In the demanding world of industrial welding, water-cooled MIG guns and TIG torches are indispensable for high-duty cycle applications. The integrity of the cooling system relies heavily on the quality of its connections. This Tweco fitting serves as the male nipple that snaps into the female coupler on your water cooler or machine face, establishing the vital link that delivers cool fluid to the torch head.

Robust Brass Construction
Durability is paramount in welding accessories. The 9-4643 is machined from solid brass, a material chosen for its superior strength and resistance to oxidation and corrosion. In a cooling loop, the fitting is constantly exposed to water or coolant mixtures, often containing ethylene glycol. Brass withstands this chemical environment far better than steel or plastic alternatives, preventing rust buildup that could clog the narrow passages of a welding torch. Furthermore, the hardness of the brass ensures that the locking groove of the QD mechanism maintains its shape even after hundreds of connect-disconnect cycles.

Optimized for Efficiency
This fitting is designed to offer unrestricted flow to the coolant supply. Any restriction in the supply line can lead to reduced flow rates, causing the torch to run hot and potentially burning out power cables or consumables prematurely. The internal bore of the Tweco 9-4643 is optimized to allow maximum fluid transfer. The quick-disconnect mechanism itself is a standard industry design used by Tweco, ensuring compatibility with a wide range of water coolers, recirculators, and welding power sources that utilize this style of connection.

Installation and Maintenance
Installing the 9-4643 is straightforward. It typically threads into the coolant hose of the torch or an intermediate cable adapter. Once installed, it allows the operator to connect the water supply in seconds without the need for wrenches. This is ideal for shops that switch between air-cooled and water-cooled setups or move power sources between bays. Regular inspection of the O-rings on the mating female coupler is recommended to ensure the male nipple continues to seal perfectly. This fitting is a direct replacement for damaged or worn connectors, restoring the integrity of your cooling system instantly.