First, purchase a new gas cylinder regulator based on the regulator style of your gas cylinder reference product. The regulator only needs to meet the requirement that the thread connecting one end of the nozzle is 4/1-19. Or look for a suitable adapter. One end of the adapter's thread is W21,8×1/14'' LH DIN 477 nr.1, and the other end is the customer's cylinder thread specification.
By vevor