Description
Westlake Pipe & Fittings 439073 0.5″ x 3/8″ MPT x FPT Threaded Bushing
The Westlake Pipe & Fittings 439073 0.5″ x 3/8″ Threaded Bushing is a high-quality PVC fitting engineered to provide a dependable and efficient size reduction between threaded pipe connections. Designed for durability, precision, and long-term performance, this threaded bushing is an essential component in plumbing, irrigation, pool and spa, and light industrial piping systems where adapting between different pipe thread sizes is required.
This bushing features a 1/2″ male pipe thread (MPT) exterior combined with a 3/8″ female pipe thread (FPT) interior, allowing installers to reduce the nominal pipe size while maintaining a secure threaded connection on both ends. Its compact yet robust design enables smooth transitions between components such as valves, pumps, manifolds, gauges, or threaded adapters without the need for multiple fittings. By simplifying size reduction in a single component, the Westlake 439073 helps minimize potential leak points and streamlines system layouts.
Manufactured from high-grade PVC (polyvinyl chloride), this threaded bushing offers excellent resistance to corrosion, rust, scaling, and chemical attack. Unlike metal fittings that can degrade over time due to moisture or chemical exposure, PVC remains stable and reliable even in demanding environments. This makes the Westlake 439073 suitable for use in both indoor and outdoor applications, including areas exposed to humidity, fertilizers, or mildly aggressive fluids.
PVC is also known for its lightweight properties, which makes handling and installation easier while reducing strain on connected piping. Despite its light weight, the material delivers impressive mechanical strength, ensuring the bushing maintains its shape and thread integrity under normal operating pressures typical of Schedule 40 piping systems.
Both the male and female threads on this bushing are molded to meet standard NPT (National Pipe Thread) specifications. Precision threading ensures proper alignment, consistent engagement, and a tight seal when used with compatible threaded components. When paired with appropriate thread sealant or PTFE tape, the connection helps prevent leaks and supports reliable long-term performance.
The male threaded exterior allows the bushing to be screwed into a larger female-threaded fitting or pipe, while the female threaded interior accepts smaller male-threaded components. This configuration is particularly useful in systems where equipment ports or accessories are smaller than the main piping, requiring a simple and effective reduction.
The long-body style of the Westlake 439073 threaded bushing provides additional engagement length compared to shorter bushings. This added length enhances thread contact, which can improve sealing performance and reduce the likelihood of cross-threading during installation. It also makes the fitting easier to tighten using standard tools, especially in confined or hard-to-reach spaces.
The smooth internal and external surfaces reflect Westlake’s commitment to quality manufacturing and dimensional accuracy. Clean molding and consistent wall thickness contribute to predictable performance and compatibility with other Schedule 40 PVC fittings and pipes. The white finish is standard for plumbing-grade PVC, allowing for easy visual inspection and seamless integration with existing systems.
The Westlake Pipe & Fittings 439073 threaded bushing is designed to be highly versatile and adaptable across many system types:
In residential plumbing, it is commonly used to connect fixtures, valves, or accessories that require smaller threaded connections than the main supply line. In irrigation systems, it helps adapt control valves, pressure regulators, or emitters to different pipe sizes without compromising joint integrity.
For pool and spa installations, this bushing is ideal for reducing threaded connections between pumps, filters, heaters, and auxiliary equipment. Its corrosion-resistant PVC construction performs well in chlorinated or chemically treated water environments. In commercial or light industrial systems, it can be used for fluid distribution, instrumentation hookups, or maintenance upgrades where threaded size reduction is needed.
Additionally, the bushing is well-suited for repairs and retrofits, allowing installers to adapt existing piping without extensive rework. Its simple design makes it a go-to solution for both professional contractors and experienced DIY users.
Westlake Pipe & Fittings is dedicated to helping contractors maximize efficiency and helping engineers design systems that entire communities can rely on.With manufacturing & distribution centers across North America, dedicated sales, technical services, specification engineers and customer support teams, our unparalleled service allows you to design, specify and install complete projects with confidence.
Westlake Pipe & Fittings 439073 0.5″ x 3/8″ MPT x FPT Threaded Bushing Features:
- Reduces from 0.5″ male pipe thread (MPT) to 3/8″ female pipe thread (FPT)
- Ideal for plumbing, irrigation, pool & spa, and general fluid applications
- Precision-molded NPT threads for secure, leak-resistant connections
- Durable PVC construction for corrosion and chemical resistance
- Lightweight yet strong for easy handling and installation
- Long-body design for improved thread engagement
- Compatible with Schedule 40 PVC piping systems
- Suitable for new installations, repairs, and retrofits
- White finish for easy identification and inspection
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