First time pool owner and poster. Can anyone help identify what part is missing here? I bought a house with a 20ish year old pool and am learning as much as I can and repairing small issues here and there. I notice the spa, pictured here, seems to be missing a piece on the supply inlet on the floor of the hot tub. There's a threaded female portion in the gunnite and it seems as though some other piece with a threaded male end is meant to be here on the floor of the spa. It functions well without it, but it shoots a powerful single stream up through this supply. I imagine there is meant to be a diffuser-type piece that's missing here. I don't know the brand of the jets in this pool. It's a Pentair system, and there's a Paramount cleaner system too, but I don't know the brand of jets or returns. Thank you for any help you might provide. Again, it functions without this piece, but I'm OCD about everything being in its place. I've found a few other missing pieces in the heater (thermostat), cleaning system (O-ring), etc., but this one has me stumped.