Installation the fuel tap or underside the float chamber of a pre-monobloc carburettor.
Union nut with pipe nipple. (pipe is soldered into the nipple) brass.
Unit nut: 1/4 BSP (19 tpi)
Nipple inner diameter: 6.4mm
Part numbers: 14/042, 14/026
BSP - British Standard pipe - often used for petrol and oil lines.