Ultimax Volute O-ring AO-251 is a black elastomer O-ring designed as an OEM replacement for Ultimax volute pumps and spa assemblies in Balboa’s Vico/Balboa line. It features a 6‑inch inside diameter and a 3/32‑inch cross-section, meeting AS568 standard #163 and aligning with the OEM part O-163B70. This part is intended for use with Ultimax volute configurations found in Balboa spa pumps and related pool equipment. Designed for reliable seal integrity, this O-ring sits at the junction between the pump and volute to prevent leaks and minimize air intrusion. Proper seating helps maintain pump prime, steady water flow, and overall system efficiency in spa and hot tub installations. The AO-251 part number provides a precise fit for service and replacement scenarios, ensuring compatibility across compatible Balboa/Vico assemblies. Key details and benefits:
- Inside diameter: 6 inches; cross-section: 3/32 inch
- AS568 standard: #163; OEM reference: O-163B70; identifying code AO-251
- Application: spa pumps and spa assemblies within Balboa Vico Ultimax systems
- Brand heritage: Balboa Water Group, known for reliable spa components and OEM replacements
| Part Type |
O-Ring |
| O Reference Number |
O-251 |
| Inside Diameter |
6"id |
| Cross Section |
3/32" |
| Kit |
No |
| Application - Category |
Pump, Spa |
| Application Manufacturer |
Generic, Vico/Balboa |
| Application Model |
Ultimax |
| Application - Part |
Volute |
| Manufacturer Part Number |
O-163B70 |
| AS568 Number |
163 |
