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NPT vs. GHT Threaded Connections: Understanding the Difference

When it comes to plumbing and fluid transfer applications, the type of threaded connection you choose can significantly impact the efficiency, safety, and overall functionality of your setup. Two common threading standards that you might encounter out in the plumbing world are NPT (National Pipe Thread) and GHT (Garden Hose Thread) connections.

While both serve the purpose of joining pipes, hoses, and fittings, they cater to different applications and possess unique characteristics. We'll delve into the key distinctions between NPT and GHT threaded connections and how they relate to our products to help you identify which would be best for your specific needs.

NPT National Pipe Thread

NPT threads are the go-to choice for plumbing and industrial applications where reliable sealing and high-pressure resistance are paramount.

Here's what you need to know about NPT connections:

  1. Sealing Mechanism: NPT threads have a tapered design to create a secure seal. As the threads are tightened, the taper ensures a tight fit, preventing leaks and maintaining system integrity.

  2. Pressure Handling: Due to their robust sealing mechanism, NPT threads are suitable for high-pressure applications. They find their place in plumbing systems, hydraulic setups, and industrial machinery.

  3. Variety of Sizes: NPT threads are available in various sizes, allowing for flexibility in choosing the right fit for your specific project. Common sizes include 1/8", 1/4", 1/2", 3/4", and 1".

NPT connections are present on most of Clean Logix's products such as BLX boot scrubbers, ALX automated chemical dispensers, and SLX manual chemical proportioners for water, chemicals, and other fluids.


Garden Hose Thread

GHT threads are primarily for outdoor water-related applications, particularly in domestic settings and gardening. Garden hose thread size is referred to in National Hose (NH) and Garden Hose Thread (GHT). The connector sizes are generally 3/4" or 5/8" (based on the internal diameter of the hose) which may vary, the most popular size is 3/4" (11.5 NH). These threads are designated as follows:

  • NH: Standard hose coupling threads of full form as produced by cutting or rolling.

  • NHR: Standard hose coupling threads for garden hose applications where the design utilizes thin-walled material which is formed to the desired thread.

  • NPSH: Standard straight hose coupling thread series in sizes 1/2" to 4" for joining to American National Standard taper pipe threads (NPT) using a gasket to seal the joint.

Here's a closer look at GHT connections:

  1. Hand-Tightened Convenience: GHT threads are designed to be hand-tightened, making them incredibly user-friendly. This characteristic is perfect for quick and tool-free connections in home environments.

  2. Pressure Considerations: GHT threads are intended for lower-pressure scenarios commonly found in household gardening, outdoor water usage, and similar activities.

  3. Distinctive Profile: Recognizable by the knurled pattern on the connector's exterior, GHT threads are purpose-built for garden hoses, faucets, and other outdoor water equipment.

Garden hose threads are not common in industrial applications. The only product line from Clean Logix that features this connection style is the SLX Filling Stations used for sink-based chemical dispensing and proportioning.

Choosing the Right Thread

Selecting the appropriate threaded connection is vital for a leak-free and efficient plumbing or fluid transfer system. Consider the following tips:

  • NPT threads when dealing with high-pressure industrial applications or plumbing systems that demand secure sealing and durability such as foaming spray applicators or boot scrubbers.

  • GHT threads when simplicity, quick connections, and lower-pressure scenarios are your priority, such as in garden hoses, outdoor faucets, or sink-based dispensers.

Understanding the differences between NPT and GHT threaded connections allows you to make well-informed choices based on your specific requirements. Whether you're embarking on an industrial project or tending to your garden, choosing the right thread type ensures optimal performance and functionality.

Have any questions? Send us a message and we'll help you out -


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