Weller t0051618299 wsta4 gas soldering iron weller t0051618299 p the weller wsta4 can function both as a soldering iron or a hot air blower tool p p it has a short heat up time and can be refilled in seconds from a gas refill cylinder a sight glass shows the level of gas in the reservoir p p temperature control is achieved by increasing and decreasing the gas flow p weller t0051618299 wsta4 gas soldering iron