The Nordson 14-thread-count Retaining Nut is used to close and seal cartridges that use 14-thread-count threads for mixing nozzles and sealing caps.
Nordson Part Number: 7660818
It is made to hold in place un-threaded mixing nozzles onto threaded, larger dispensing cartridges (200ml, 400ml, 600ml, and 1500ml). As well as for ALL 14-thread-count Nordson Ratio-Pak style cartridges.