Roman Fountains RPSS-100 RPSS Series Flush Sunshelf Nozzle, 1" FNPT. The RPSS Flush ‘Sunshelf’ Nozzle is designed to be installed in a submerged setting producing a vertical mound of water. This nozzle uses concentric rows of precision orifices to push through the shallow water. The RPSS nozzle is of machined brass construction with, machined brass jet orifices, recessed removable cap for easy cleaning, bonding lug and 1" (F) N.P.T. connection. Greater submergence depth creates a broader and fuller display, but requires greater gpm and pressure. Fine screening at the pump is recommended to minimize nozzle clogging.