2 pieces of 4mm Air Line taps with barbed ends.
** The tap may vary from the one shown in the picture **
The taps are a quality 1/2 turn valve tap (not screw down type)
They are suitable for air and liquids and give easy control by rotating the knob,
they cannot be turned too far as they are limited to a half turn from full on to closed.
Actual taps may vary from the one shown in the picture.