2″ X 1.5In Buttress Adapter 92165 Balboa Water Group

The 2" X 1.5In Buttress Thread Adapter (92165) from Balboa Water Group is purpose-built for hot tubs and whirlpool baths that demand flexible, high-flow plumbing configurations. By bridging a 1.5" pump fitting with a 2" suction, it creates a streamlined water path that enhances turnover and overall spa performance without a full re-pipe.

• Pairing a larger 2" suction with a 1.5" threaded collar on the pump delivers more efficient water movement than sticking to a single-size connection. This is especially beneficial for tubs that rely on standard 1.5" pump fittings but can gain from a larger suction pathway.
• Flexible connection options: The first plumbing connection accommodates 1-1/2" with either Male Buttress Thread (MBT) or slip, while the second connection accepts 2" with MBT or slip. This versatility makes retrofits and installations easier, even when existing hardware varies.
• Union-friendly design: Built with union fittings in mind for clean, serviceable connections. A 2" union is available separately, giving you additional options for disassembly and maintenance without re-piping.
• Trusted brand heritage: Crafted by Balboa Water Group (Balboa / AquaFlo / Gecko), a long-time name in spa components. Choosing this adapter means tapping into a proven lineage of reliability and spa-ready design.

This adapter shines in retrofits and installations where you need to convert a 1.5" pump fitting to a 2" supply, then taper back to the pump’s 1.5" threaded collar. It’s a practical solution for Whirlpool tubs and Balboa-powered systems that previously relied on a standard 1.5" collar but would benefit from a larger suction for improved circulation and turnover. It’s commonly used in setups reminiscent of Aquatic Bath configurations and other Balboa-compatible tubs, offering a straightforward path to greater water movement without a major piping overhaul.

Specifications at a glance

• 1-1/2″
• Male Buttress Thread (MBT) or Slip
• Second Plumbing Connection Size: 2″
• Second Plumbing Connection Type: Male Buttress Thread (MBT) or Slip
• Union Fitting Part Type: Adapter
• Manufacturer: Balboa Water Group (Balboa / AquaFlo / Gecko)
• Model: 92165

Who should consider this adapter: Homeowners upgrading an aging spa or hot tub with a 1.5" pump collar seeking better flow through a 2" suction; service professionals performing retrofits on Whirlpool baths that use Aquatic Bath-style configurations or other Balboa-compatible components; DIY enthusiasts looking for a reliable, brand-backed solution to connect differing pipe sizes without a major re-pipe.

With the 2" X 1.5In Buttress Thread Adapter 92165, you’re not just swapping fittings—you’re strategically upgrading your spa’s plumbing to support stronger circulation, easier maintenance, and longer-lasting performance. A small change, but one that yields noticeable improvements in water movement and system efficiency.