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What size is a garden hose connector?

Updated February 21, 2017

Garden hose thread is a specific size and pitch that is not compatible with any other plumbing fittings. Its design facilitates a secure seal with hand tightening only, under most circumstances.

Standard

According the American National Standards Institute, garden hose thread--GHT--has an outside diameter of 1.0625 inches with 11.5 threads per inch.

Seal

Garden hose thread relies on a flexible washer to create a watertight seal, as opposed to pipe thread in which the taper of the thread and sealing compound applied to the thread create the seal.

Fittings

Fittings that will adapt from pipe thread--NPT--to garden hose thread--GHT--can be found in any plumbing supply store or do-it-yourself home centre. They will be designated by the pipe size on the NPT side and simply GHT on the other. For example an adaptor with a 3/4-inch pipe thread on one end and garden hose thread on the other end would be identified as 3/4-inch NPT x GHT.

Reliability

Garden hose thread has a history of minor leaks. These can usually be traced to missing, cracked or deformed washers, though faulty fittings contribute, too.

Repair

Garden hose repair fittings are widely available. In most cases the fittings completely replace the fittings currently on the hose and are held in place by hose clamps. It's always a good idea to attempt to fix a leaky garden hose fitting by installing a new washer before replacing the fittings.

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About the Author

Jeff Farris has focused on instructional communication since 1980. His work includes instruction manuals, promotional materials, video scripts and web content on a variety of hands-on topics. His work has been published in "Scuba Diving" magazine as well as several websites. He holds a Bachelor's degree in marketing from the University of Missouri.