5" Face Quantum Jet Inserts by Rising Dragon.

Available in Directional (Black), Single Pulse or Multi Port (Black or Stainless Steel).

If you're replacing older Snap-In Style Jet Inserts (no longer made), you also need a Screw-In Adapter for each jet you replace.

Commonly used in Arctic Spas, Four Winds Spas, Morgan Spas, Sunbelt Spas and others.