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The tapered needle tip opens and closes the paint flow inside the nozzle by moving the operating lever back and forth. If you want to convert your spray gun to the Large nozzle size, please replace the spray jet regulator (Item No. 38035), needle and the nozzle (Item No. 38075) together. We recommend our complete spray jet attachment (head, nozzle and spray jet regulator item no. 38085) for conversion. This spare part is suitable for the Spray Gun Student ISB 500, art. no. 39102.
