More About Garden Hose Fittings and Threads:
Garden hoses connect using a Male / Female thread connection. Hose Bibbs and Spigots typically have male connectors and the hose has a captive Brass Garden Hose swivel nut which fits the male threads. The technical term for this arrangement is a Hose Union. The thread standard for garden hoses in the United States and its territories is known as GHT or "garden hose thread", which has an outer diameter of 1 1⁄16 inches (26.99 mm) and a pitch of 11.5 TPI2.2 mm; parallel thread (non-tapered). Outside the United States, the BSP standard is used, which is 3/4" 1.041 in or 26.44 mm OD) and 14 TPI 1.8 mm. The GHT and BSP standards are not compatible.
Each end of a typical garden hose can mate with another, which allows multiple garden hoses to be linked end-to-end to increase their overall length. Garden Hose Washers are used in the female ends to prevent leakage, because the threads are not tapered and do not create a seal. Sometimes these seals disintegrate or fall out of older hoses, which results in pressurized leakage spraying from the hose; simply replacing the Garden Hose Washer often fixes the problem.