The opening for the Chapin Brass Nozzle Adjustable Cone for Poly Shut-Off (6-6002) for this is .055 and is specially made for Chapin sprayers.
The Chapin Adjustable Brass Cone Pattern Nozzle for Poly Shut-Off Nozzle is a genuine replacement part that fits on all Chapin sprayers with a poly discharge. It is an adjustable pin to cone spray pattern, not a fan spray.