Balboa - HydroAir Micro Jet Eyeball Spa Jet - 10-3700

Balboa – HydroAir Micro Jet Eyeball Spa Jet

The Balboa HydroAir Micro Jet Eyeball, part number 10-3700, is a replacement hot tub jet that gives a precise and strong massage. It is part of the HydroAir Micro-Jet assembly and screws into the matching socket, reference 10-4200. This listing is for the eyeball jet itself, supplied with its sealing gasket.

Compatibility with the HydroAir Micro-Jet assembly

The Balboa / HydroAir 10-3700 eyeball jet is designed as a component of the HydroAir Micro-Jet assembly. It is not a stand-alone fitting: it is screwed into the corresponding socket, which carries the reference 10-4200.

If your spa jet is a Micro-Jet from this range and the eyeball face needs replacing, 10-3700 is the part number to look for. The socket is a separate part and is not covered by this page.

Fitting and dimensions

Check the measurements below against your spa shell and your existing jet before ordering this hot tub jet replacement.

• Diameter of the hole to drill in the shell (outside thread diameter of the jet): 41 mm
• Maximum shell thickness: 18 mm
• Length: 40 mm
• Outside diameter of the jet face: 69 mm

The jet is screwed into its socket (10-4200), with the sealing gasket in place.

What is included

The Balboa 10-3700 Micro Jet Eyeball is supplied with its sealing gasket.

The matching socket, reference 10-4200, is not mentioned as part of the supply, so check whether you also need it for your assembly.

How to choose the right part

Spa jets look similar from the front, so compare the part number and the dimensions rather than appearance alone. Look for the reference 10-3700 (HydroAir / Balboa) on your current eyeball jet or in your spa documentation, and confirm that your jet is part of a HydroAir Micro-Jet assembly.

Measure the outside diameter of the jet face (69 mm) and the thread diameter (41 mm) to confirm that the replacement matches the jet you are removing.