Spray Nozzle Assortment 4.5 mm, Five (5) pack of orifice quick connect spray nozzles. Designed for a 1/4 inch (6.35 mm) quick coupler and ideal for quick exchange of spray nozzle and spray guns. Connects to all of the most common pressure washer equipment in the industry. 300 degree Fahrenheit (148.9 degree Celsius). 4,000 PSI.