The PP351-BASE mounts were designed for outdoor use with small-size pendant domes (such as Spectra and DF5 Series), and outdoor use with medium-size pendant domes (such as DF8 Series). Accommodate domes that use 1.5" NPT pipe. This can be used in applications where mounting and height clearances of model PP351 are inadequate. The mounts are designed to swivel within available clearance limits, which adds to the flexibility, easy maintenance, and usability of the configuration. Manufactured from aluminum, the mounts include indexing bolts to secure the arm in position.