Air cap is attached after the nozzle nut, this is a front tip or cover of the gun.
Nozzle nut is fitted after the blasting nozzle .this is used for tightly hold the nozzle in the gun body and completely fit the wire. It is the main Spare Part of Flame Spray Gun.
In the flame spray gun, there is a nozzle after the siphon plug. Whenever a nozzle is put on the gun, the bore of the siphon plug should be wiped clean and put on the nozzle O-rings. The nozzle nut must be tight on the siphon plug. Firm tightening by hand is sufficient. Overtightening the nozzle nut can cause damage. From the back end, blow out the holes with compressed air.
Wire comes first in the siphon plug and then in the nozzle, it completely holds the wire. The siphon plug should be cleaned occasionally. Wipe out the grooves and clean out the holes with the proper size wires from the cleaning wire kit. Do not wash the o-rings with a cleaning solvent. Examine them for damage and replace them if required. Do not stretch new o-rings more than necessary. Lubricate all o-rings before reassembling the siphon plug.