IF YOU WANT TO GO FAST , THIS IS WHAT YOU NEED . PTS PRECISION TUNED NOZZLE , FITS BERKELEY JET PUMP , AND MANY OTHER JET PUMPS . HAS 2 TEFLON O RINGS FOR SEALING , NICE TAPER INSIDE . WITH 4 NOZZLE INSERTS - 3.187, 3.125 ,3.090 , 3.060 . THE VENTURI (INSIDE ) OF THE NOZZLE IS PRECISION TUNED ( BLUEPRINTED ) FOR MAXIMUM VELOCITY AND THRUST . SOME PARTS HAVE BEEN USED . ( THIS NOZZLE WITH  4 INSERTS SELLS FOR $ 1067.00 YOU CAN BUY FOR $ 533.50 ) half the price of new . EVERY THING IN VERY GOOD OR NEW CONDITION . THERE ARE NO REFUNDS . MAKE SURE THIS IS WHAT YOU WANT .