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airline equal union connector

Air Line Equal Union Double Male 1/4" BSP Fittings


Equal double union with 1/4" BSP taper male thread on each end. High quality zinc plating.

1/4" BSP is the most popular size of thread used on airlines, air hoses, air compressor fittings and air tool fittings.

The easy way to convert female threaded air fittings into male fittings. These equal unions are often used as a joiner to double the length of workshop airlines and air hoses.

Sizing advice

BSP thread sizes can be confusing; BSP size is not the same size as the physical thread diameter. When measuring BSP male taper threads the measurement should be taken halfway along the length of the thread. BSP female threads are always parallel along the whole length of the thread – see size guide below.

BSP size                 Diameter of thread

¼”           -               13.1mm Approx.

3/8”         -               16.6mm Approx.

½”           -               21.0mm Approx.


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