The inner pipe of the return inlet has no threads to screw in an eyeball connection. The very end of the inlet pipe has a plate that has four notches in it that looks like an eyeball ring with four notches would screw onto it. I can't find such a ring though. Do i need to get a thread-less eyeball connection to bang into the thread-less return inlet? I can't imagine it would withstand the pressure and just blow into the pool.