Replacement Single Flat 0.8mm Tip for WLUBU75 Weller s Cordless Butane Soldering Iron. The Signal Flat is easy to replace without a tool and is perfect for your electronic soldering tasks. Solder on-the-go with Weller s Soldering Iron & Heat Tool. 25W-75W butane provides continuous no-stop soldering. With quick and easy butane refills wide range of tips auto shut off and the ability to convert for hot air/torch applications it s perfect for your soldering tasks.