There are 4 pieces for the nozzle injection body assembly:
Injection Body Cartridge
Injection Body Thumb Cap
1″ Closed Nipple
This assembly connects to the nozzle with a closed nipple. This allows the alum to inject into the fireproofing at the nozzle. The alum quickens the drying time of the fireproofing which allows fire proofers to do more coats in a shorter period of time.