Waterway Male Hayward Union Threaded Adapter [1-1/2" FBT x 2" MHT] [Without O-Ring] (319-3121)

Type:	Fittings & Valves: Unions
Mfr	Waterway Plastics
Mfg Part #	319-3121
Hzn Part #	89-270-1170

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TAGS: pvcfittings, unions, waterway

Details

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SEE REPLACEMENT PART: OBSOLETE

Waterway Male Hayward Union Threaded Adapter [1-1/2" FBT x 2" MHT] [Without O-Ring] (319-3121) is a replacement sealing part used to help prevent water or air leaks in compatible pool, spa, bath, or equipment assemblies. Gaskets and O-rings should be replaced when they become flattened, brittle, cracked, swollen, or no longer provide a dependable seal. Part number 319-3121 should be matched to the exact equipment model, location, and dimensions before installation. Notable specifications from the item name include 1-1/2" FBT x 2" MHT, Without O-Ring, which helps confirm fit and configuration before ordering.

This Waterway Plastics sealing component is a small but important repair item because a worn seal can lead to dripping, loss of prime, pressure issues, air intrusion, or equipment inefficiency. Proper cleaning of the sealing surfaces is just as important as the replacement part itself.

For best performance, remove old residue, inspect mating surfaces for damage, and use only the lubricant or installation method recommended for the application. Correct fitment helps protect surrounding parts and reduces the chance of repeat service.

Replacement gasket or O-ring for compatible equipment
Helps reduce leaks, air intrusion, and pressure loss
Match by part number, dimensions, and application location
Replace when seals are flattened, cracked, brittle, or swollen
Clean sealing surfaces before installation for best results

Waterway Plastics – Spa Jets, Pumps, Filters, Valves and Pool & Spa Components

Who is Waterway Plastics?

Waterway Plastics is a leading manufacturer of pool and spa components, known for durable construction and broad product compatibility. With decades of experience, Waterway provides essential parts used in both residential and commercial aquatic systems.

What products does Waterway Plastics specialize in?

Waterway Plastics specializes in spa jets, pumps, filters, valves, manifolds, and plumbing components. Their product lineup includes critical parts used in spa and pool systems for water circulation, filtration, and hydrotherapy performance. Waterway components are widely used in both OEM and replacement applications.

Why choose Waterway Plastics parts for your pool or spa?

Waterway Plastics products are known for reliability, compatibility, and long-lasting performance. Their components are engineered to withstand water pressure, chemical exposure, and continuous operation. Spa owners and professionals choose Waterway for dependable parts that maintain system performance and extend equipment life.

How do you identify and choose the correct Waterway Plastics part?

To select the correct Waterway component, it’s important to match specifications such as size, connection type, jet style, and system compatibility. Reviewing model numbers and part dimensions ensures proper fit and function. Choosing the right part helps maintain efficient operation and optimal spa performance.

Need help finding the right Waterway Plastics part?

At Bath & Spa Parts Online, we carry a wide selection of Waterway Plastics 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.