... Nozzles, 1. Standard Type: GV11, GV12, GV13 and GV14Jet inserts made from special material with high abrasive resistance and strength ... .2. High Efficiency Type: GV22, GV23, GV24 and GV25Jet inserts with vortex chamber made from special material with high abrasiveresistance ... .3. High Speed Type: GV31, GV32, GV33 and GV34Jet inserts made from special material with high abrasive resistance and strength ...