Gardena House connectors

In other countries, a British Standard Pipe (BSP) thread is used, which is ³â�„₄ inch (19 mm) and 14 TPI (male part outside diameter is 26.441 mm or 1.04 in). The GHT and BSP standards are not compatible, and attempting to connect a GHT hose to a BSP fitting, or vice versa, will damage the threads.

Various adaptors made of metal or plastic are available to interconnect GHT, BSP, NPT, hose barb, and quick connect fittings.

Quick connectors

Starting in the 1990s, the use of quick-connector systems has become more popular. These are fittings that screw into the common hose connectors, allowing hoses and accessories to be easily connected together using a snap-fit system. The style manufactured by Gardena is common, imitated by and compatible with many other manufacturers. The connectors may optionally include an internal valve that is only opened by connecting the fitting, so that disconnecting a hose using this adaptor causes the water flow to stop. This greatly eases common tasks by allowing specialized sprayers to be interchanged without requiring two trips back to the spigot for each change.

Hozelock

Around 1955 Hozelock Ltd in the United Kingdom invented and patented the international standard plastic, click-on style, push-fit hose end connector now used with garden hoses. The concept was developed to replace metal hose end connectors in coal mines, which were prone to cause static sparks and the possibility of methane gas explosions. All-metal versions of the connector (and compatible with the plastic versions) are now in common use for garden hoses. The system is now universally used by gardeners throughout the world. The Hozelock brand adapters are typically available with BSP threads, while the compatible Gardena brand, sold mostly in the U.S., uses ¾-11.5NH (Garden hose thread) threads. There are two different sizes of the connectors available, with the larger one being rare and mainly used on ³â�„₄″ hoses.

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