These sewer jetting nozzles are used in wide range of cleaning applications. The two major application groups are sewer and drain cleaning and industrial pipe and tube cleaning. In addition, there are other speciality applications such as hydro drilling (using high pressure water as the cutting agent to drill holes in rock and soil). We at Ultimate Washer, offer nozzle sizes from 1/8", perfect for small electric or gasoline jetters used in residential applications, up to 3/8" NPT nozzles suitable for large trailer mounted equipment used for city municipal applications and commercial treatments.