Water Hose Coupler 5/8"-18 LH Female x 5/8"-18 LH Female for Water-Cooled TIG Torches Recirculating Systems. High-quality Brass - TIG Water Line Hose Coupler This coupler is used to attach two Tig water hoses together. ÃƒÂ¢Ã¢â‚¬Â¦Ã‚ÂÃƒÂ¢Ã¢â€šÂ¬Ã‚Â-18LH Female x ÃƒÂ¢Ã¢â‚¬Â¦Ã‚ÂÃƒÂ¢Ã¢â€šÂ¬Ã‚Â-18LH Female. Fits with most of American Water-Cooled TIG TorcheSÜAndWeldas water hoses with ÃƒÂ¢Ã¢â‚¬Â¦Ã‚ÂÃƒÂ¢Ã¢â€šÂ¬Ã‚Â-18LH Male fittings. This coupler can also be used to connect Water-Cooled TIG Dinse Plugs Connectors with a water line to the water cooling system.