Designed for pool, spa, and hot tub systems, the Waterway Pump Union Nut with Hose Adapters (400-9280) is a ready-to-install half-union kit that simplifies pump maintenance and ensures a secure, leak-resistant connection.
This complete assembly combines a pump-side union nut, dual hose adapters (1-1/2" and 1-1/4"), and an O-ring for a reliable seal on Waterway pumps.
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Compatibility: Fits 1-1/2" pump unions and includes 1-1/2" and 1-1/4" hose adapters for versatile plumbing connections (FBT on both ends).
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O-ring Included: Sealed design with an integrated O-ring to minimize leaks and keep your system running smoothly.
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Complete Half-Union Kit: All necessary components are included for a straightforward replacement or upgrade.
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Material & Build: White, durable plastic construction designed for the harsh chemicals and constant use typical of pool, spa, and whirlpool equipment.
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Brand & Origin: Waterway Plastics—a trusted American-made manufacturer with a long history of pool and spa hardware since 1973.
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Part Number: 400-9280, a standard Waterway fitting that supports quick identification and compatibility checks.
This Waterway half-union fitting is ideal for replacing worn or damaged pump connections or upgrading your pool or spa plumbing. The dual hose adapters cover common sizing needs, while the buttress thread design ensures a robust, secure fit. Built to endure typical pool and spa environments, it provides a reliable, long-term solution for maintaining leak-free operation and easy service access.
| Half Union Fitting Complete |
Complete Half Union |
| Union Fitting Application |
Pump |
| First Plumbing Connection Size |
1-1/2", 1-1/4" |
| First Plumbing Connection Type |
Female Buttress Thread (fbt), Hose Adapter |
| Second Plumbing Connection Size |
1-1/2", 1-1/4" |
| Second Plumbing Connection Type |
Female Buttress Thread (fbt), Hose Adapter |
| Manufacturer |
Waterway |
WHY USE WATERWAY PRODUCTS?
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At Waterway Plastics, a commitment to design, innovation and quality American made products makes for a solid combination of style and dependability. All Products are designed and manufactured in America. Waterway has been a leading manufacturer of pool and hot tub/spa and Whirlpool Bath equipment for the USA and international markets since 1973. Located in Oxnard, California in 450,000 square feet of manufacturing and warehousing facility, Waterway is one of the largest employers in Ventura County. Waterway is recognized as an innovator of quality products with an extensive line of jets, pumps, filters, filter systems and white goods for in-ground and above ground pools, spas and bath.
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