A barbed fitting that connects two hoses of the same internal diameter in a straight line. Ours are ABS plastic - lightweight, corrosion resistant and inexpensive, which makes them the practical choice for low-pressure water, pond, ducting and general workshop plumbing.

Match the barb outside diameter to your hose internal diameter. It should need a firm push to go on - warming the hose end in hot water makes a tight fit far easier. If it slides on loosely it is too small, and no amount of clip tension will make that joint reliable.

On anything pressurised, or anything that matters if it comes off, yes - one each side. The barb resists pull-off but does not seal by itself once the hose relaxes with age and temperature. A stainless clip is cheap insurance on a joint that would otherwise flood something.

For anything pressurised, hot, or carrying fuel or oil. Plastic has neither the temperature range nor the strength for engine bay work. We stock aluminium beaded and unbeaded joiners from 8mm to 102mm and silicone couplers from 13mm to 152mm for those applications.

Use a reducing joiner rather than stretching one hose over an oversized barb, which seals unevenly and creeps loose. We stock straight reducing joiners and inline reducing connectors, plus 45 and 90 degree reducing versions if the run also changes direction.

They are general-purpose ABS fittings for ambient and low-temperature use. Keep them away from engine bays, hot process fluid and exhaust heat. If you are unsure whether your application is within range, tell us the temperature and we will confirm.