The Quad-F kit includes an Enforcer nozzle instead of a Polisher Nozzle found in the Pro 4 Piece kit. The "Enforcer" nozzle combines increased thrusting power with a wide-angle spray for greater force in more challenging situations. Pressure rated to 10,000 psi. Currently available in 1/4-, 3/8- or 1/2-inch sizing with wrench flats for more secure operating and nozzle recovery.