Balboa Air Injector Connector W/Barb [3/4" Spigot x 3/8" Barb] (31-9403)

Type:	Fittings & Valves: Manifolds
Mfr	Balboa Water Group
Mfg Part #	31-9403
Hzn Part #	35-470-1007

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TAGS: balboawater, manifolds, pvcfittings

Details

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SEE REPLACEMENT PART: OBSOLETE

Air systems rely on a chain of small, properly fitted parts, and connectors like this are what keep that chain working. This air injector connector is designed to join a compatible 3/4 inch spigot connection to a 3/8 inch barb line, giving the system a secure transition point where airflow needs to move cleanly between components.

When connectors become brittle or cracked, the air side of the spa can lose some of its consistency. Bubbling may feel weaker, injector performance may vary, or the repair may never seem fully finished because one compromised fitting keeps causing trouble. Replacing the correct connector is often the simplest way to stop that cycle.

The specialized sizing matters because air-line fittings are not interchangeable just because they look similar. A proper match means the tubing seats better, the connection feels more secure, and the installation is less likely to depend on temporary workarounds.

For homeowners, that translates into a repair that feels cleaner and more reliable. Once installed, the air path is better supported, the injector side of the system behaves more consistently, and the spa feels closer to the way it is supposed to perform.

Connector for compatible spa air-line transitions
3/4 inch spigot to 3/8 inch barb configuration
Helps secure tubing in injector-related plumbing paths
Useful when cracked fittings affect air performance
Focused replacement for cleaner and more dependable repairs

Balboa Water Group – Spa Systems, Pumps, Heaters & Control Components

Who is Balboa Water Group?

Balboa Water Group is the world’s largest manufacturer of spa systems, components, and control technology, producing an estimated 70% of all hot tub systems globally. With decades of industry leadership, Balboa is the driving force behind many of the pumps, heaters, control packs, and circuit boards used by top spa brands. Known for innovation, reliability, and engineering excellence, Balboa has become the standard for spa system performance worldwide.

What products does Balboa Water Group specialize in?

Balboa specializes in complete spa system solutions, including control systems, topside panels, circuit boards, heaters, pumps, sensors, jets, and accessories. Their systems are designed to seamlessly integrate temperature control, water flow, filtration, and lighting. Balboa products are widely used in both new spa manufacturing and replacement parts, making them one of the most commonly sourced brands for hot tub repair and upgrades.

Why choose Balboa Water Group parts for your pool or spa?

Balboa parts are trusted for their compatibility, durability, and consistent performance across a wide range of spa systems. Because Balboa components are used in the majority of hot tubs on the market, finding compatible replacement parts is easier and more reliable. Their advanced control technology allows precise management of temperature, jet functions, and energy usage, helping extend equipment life while improving the overall spa experience.

How do you identify and choose the correct Balboa Water Group part?

To select the correct Balboa part, it’s important to match your existing system’s model number, circuit board type, heater configuration, and topside control compatibility. Checking labels on control packs and referencing wiring diagrams or product manuals ensures proper fit and function. Choosing the correct Balboa component helps maintain system efficiency, prevents compatibility issues, and ensures safe operation.

Need help finding the right Balboa Water Group part?

At Bath & Spa Parts Online, we carry a wide selection of Balboa Water Group pool, spa, and bath parts ready to ship. Can’t find what you need? Contact our Product Specialists at 800-918-9143, use the live chat, or visit our Contact Us page. For installation guides, part diagrams, and troubleshooting resources, visit the Bath & Spa Parts Online Knowledge Base for expert support.