ThePipingMart Blog Fasteners Weldolet vs Half Coupling – What’s the Difference

Weldolet vs Half Coupling – What’s the Difference

Weldolet vs Half Coupling

In industrial applications, piping systems involve various components, including fittings, valves, and flanges. Among these, wallets and half couplings are commonly used to connect pipes, redirect fluid flow, and allow for safe and efficient system operation. While both fittings serve the same purpose, several differences exist in design, installation, and performance. In this blog post, we look closer at wallets and half couplings, their advantages and disadvantages, and which one to choose based on your specific needs.

What is Weldolet?

A weldolet is a type of branch fitting used to connect a smaller pipe to a larger one or change the flow’s direction within a pipe. It is designed to be welded onto the run pipe, forming a branch connection without disrupting the flow of the main line. Weldolets, such as high-pressure and high-temperature pipelines, are commonly used in applications requiring high structural integrity and strength. The benefits of using wallets include increased strength, durability, and resistance to corrosion.

What is Half Coupling?

A half coupling is a fitting used to connect two pipes end-to-end. A threaded coupling connects a pipe directly to a valve, pump, or another component without welding. Half couplings are typically used in low-pressure applications where strength is not a primary concern. They are also easier and less expensive to install than wallets, as they do not require special welding equipment or techniques.

Difference Between Weldolet and Half Coupling

Several factors must be considered when deciding whether to use a weldolet or half coupling. If your application requires a high level of strength and durability, a weldolet may be the best option. Weldolets provide a stronger and more secure connection than half couplings, especially in high-pressure or high-temperature applications. They are also more resistant to vibration, thermal expansion, and corrosion.

However, if your application involves low-pressure systems or situations where component replacement or maintenance is frequent, a half coupling may be a better choice. They are easier to install and allow greater piping system flexibility. Half couplings are less expensive than wallets, making them cost-effective for applications with lower structural demands.


In summary, wallets and half couplings are essential components of piping systems that serve different purposes. Weldolets provide a stronger and more durable connection, making them ideal for high-pressure and high-temperature applications. Conversely, half couplings are easier and less expensive to install, making them a better choice for low-pressure systems or applications that require frequent maintenance. Choosing the right fitting depends on your needs, budget, and requirements. If you need assistance choosing the right fitting for your application, we recommend consulting with a qualified piping engineer or supplier.

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