Good water distribution system is a critical component of any biofilter. Our Spray Nozzles are specifically designed with a 1" orifice for adequate water distribution in our Bakki Showers. Has 2" male NPT threads. This is an innovative nozzle design that provides a solid cone, square spray pattern. It has a very open, clog free design. The water distribution pattern is excellent. Use (3) for our large Bakki Shower, and (2) for the small size shower.