Description
Westlake Pipe & Fittings 436341 3″ x 4″ MPT x SKT Male Reducing Adapter
The Westlake Pipe & Fittings 436341 3″ x 4″ Male Reducing Adapter is a high-performance PVC fitting engineered to provide a secure, dependable transition between threaded and socket connections while accommodating a change in nominal pipe size. Designed for demanding plumbing, irrigation, industrial, and pool & spa applications, this fitting reflects Westlake’s commitment to durability, dimensional accuracy, and long-term system reliability.
This male reducing adapter features a 3-inch Male Pipe Thread (MPT) on one end and a 4-inch Socket (SKT) connection on the other, allowing installers to efficiently connect a larger solvent-weld PVC pipe to a smaller threaded female fitting. This configuration is commonly required in systems where flow paths must be adapted, equipment ports vary in size, or legacy components need to be integrated into updated piping layouts. The reducer design simplifies installation while eliminating the need for multiple fittings, helping reduce potential leak points and installation time.
Manufactured from high-quality PVC (polyvinyl chloride), the Westlake 436341 adapter offers excellent resistance to corrosion, scaling, and chemical degradation. Unlike metal fittings, PVC does not rust or pit, making it an ideal material for wet environments, buried installations, or systems exposed to aggressive water conditions. Its lightweight nature also improves handling and reduces strain during installation, particularly important for larger-diameter fittings such as this 3″ x 4″ reducer.
The adapter is designed for Schedule 40 PVC piping systems, ensuring compatibility with widely used industry-standard pipes and fittings. Schedule 40 construction provides a balance of strength and practicality, making it suitable for pressure and non-pressure applications alike. When properly installed using appropriate solvent cement on the socket end and thread sealant or PTFE tape on the threaded end, this fitting forms a secure, long-lasting connection capable of handling everyday operational demands.
A key advantage of the long-body design is enhanced installation reliability. The extended socket depth allows for better solvent cement coverage, improving bond strength and reducing the risk of joint failure over time. On the threaded side, the extended male threads provide deeper engagement with the mating female fitting, helping to ensure a tight, leak-resistant seal. This is especially valuable in high-flow or high-vibration systems where connection integrity is critical.
Flow efficiency is another important benefit of this reducing adapter. The smooth internal bore of the PVC fitting helps minimize turbulence as fluid transitions from the larger 4-inch socket side to the smaller 3-inch threaded side. Reduced turbulence contributes to more consistent flow, lower pressure loss, and decreased wear on downstream components. This makes the adapter suitable not only for water distribution but also for various non-potable fluid handling applications.
In commercial and industrial plumbing systems, the Westlake 436341 male reducing adapter is frequently used to connect pumps, filters, valves, and manifolds where threaded equipment ports differ from pipeline diameters. In irrigation systems, it allows main lines to be stepped down efficiently while maintaining strong mechanical connections. In pool and spa installations, the threaded end can connect directly to equipment housings while the socket end integrates seamlessly with PVC piping networks.
The fitting’s clean white finish is standard for PVC pressure fittings and allows for easy visual inspection during installation and maintenance. Its precision-molded dimensions ensure consistent performance and ease of assembly, even in complex systems where alignment and spacing are critical. Because it meets established industry norms, it can be confidently paired with other Schedule 40 PVC components from Westlake or compatible manufacturers.
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 436341 3″ x 4″ MPT x SKT Male Reducing Adapter Features:
- The Westlake Pipe & Fittings 436-341 is a Schedule 40 PVC adapter designed for connecting various piping systems
- This fitting features a three-inch Male Pipe Thread (MPT) on one end and a four-inch slip connection on the other end
- This adapter provides flexibility in piping systems by accommodating different connection types and sizes
- It supports temperatures up to one hundred forty degrees Fahrenheit
- 3″ Male Pipe Thread (MPT) x 4″ Socket (SKT) configuration
- Ideal for plumbing, irrigation, pool & spa, and industrial use
- Long-body design for stronger joints and easier installation
- Lightweight yet strong for large-diameter applications
- Suitable for solvent-weld and threaded connections
- Durable PVC construction for corrosion resistance
- Compatible with Schedule 40 PVC pipe systems
- Smooth internal bore for efficient fluid flow
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