Hydroair (Monarch) Jet Diverter Control Repair Kit - Rotor, Handle & Cap Kit
A very common diverter on many brands of spas. This is the internal diverter rotor, handle and cap. You may need to sand the inside of the diverter to allow free movement of the new rotor and handle. This should ideally be flushed monthly to remove any grit.
Common on Monarch Spas