This General Rotomax Rotating Nozzle features a 0-degree nozzle that oscillates in a pattern that covers about the same area as the standard fan nozzle. Because the 0-degree nozzle concentrates the pressure, you get greater cleaning efficiency from your pressure washer, but still cover the same area as a fan nozzle. This nozzle is the #3 (black) nozzle and is recommended for 4.2 - 5.5 gallons per minute at 3500psi maximum pressure, with a maximum temperature of 176F. The inlet is 1/4" FPT. We recommend using a 87101490 high-pressure filter in the inlet of the nozzle to protect it from any foreign material, which could damage the internal moving parts and delicate ceramic seats.