So for instance an adapter/coupler can be male/male, male/female, female/female, male/quick connect or female/quick connect. There's also more flexibility in the gender of fittings to allow mixing and matching of hoses and accessories to other hose systems. Quick connect adapters can also be screwed to the bibcock, spray nozzle or either or both ends of the hose to make the system push fit. The other end of the hose that connects to the spray head has a 3/4" male threaded fitting. In the US, typically a 3/4" female threaded fitting is crimped to the end of the hose that connects to the bibcock, allowing it to be simply screwed on. Types of Fittings on the End of US and UK Hosesįittings differ somewhat between the United States and the United Kingdom. Usually hose goes by the internal diameter, but sometimes external diameter is quoted. A 3/4-inch ID hose is generally reserved for professional use, the greater internal diameter resulting in less pressure drop over distance and a higher flow rate for the same pressure at the source.What Are the Internal Diameters of Garden Hoses? Pipes historically would have had a thicker wall and 1/2" would have been the inside measurement of the pipe. For instance a 1/2" BSP thread has an external diameter of about 21 mm or 53/64", whereas 1/2" is approximately equal to 12.5 mm. Thread sizes historically referenced the internal diameter of a steel or copper plumbing pipe that was used with the fitting. No, it's neither the internal nor external diameter. Domestic plumbing fittings vary in diameter, but also have BSP threads.ĭoes thread size refer to the actual diameter of the thread?.Taps used on farms, factories and in horticulture, and fittings for garden irrigation pumps often have a 1 inch or 7/8" BSP outlet. ![]()
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