Grex X40NS.16 (1.6mm) Nozzle Kit for X4000 Spray Gun Grex from $109.00 $129.00 Qty. Add to Cart SKU: GRX-X40NS-16 This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. This converts the Grex X4000 Spray Gun to a 1.6 MM nozzle configuration. Includes nozzle, needle and nozzle cap. Tweet