This part is an Air Injector Connector, HydroAir, 3/4"spigot x 3/8"barb.
NOTE: This part is obsolete as the clear plastic does not hold up. We will send you the closest equivalent part that will work...
This part is a Jet Face, 1-3/4", HydroAir, Duo Blaster, 5 Scallop, Gray..
This jet has other parts the can be found in the below links and are sold separately: