RD203-3610 or RD203-3610-000 Is a 3 in Black and Grey jet

3" Alpha Face Directional Jet Internal - Two Tone (Screw-in) 

This is a Quantum Series, thread-in type spa jet that is 3 inches in diameter and has an Alpha style jet face with directional nozzle.

 RD203-3610-000 or RD203-3610