Both sides threaded: 1/4" BSPP Female x Female
Suits an outside diameter (OD) of: 13.79mm
Material: Malleable Iron
Finish: Hot Dip Galvanised (HDG)

Standards:
Nominal Bore, Threaded, Screwed, Low Pressure, 300 psi, Mild Steel (Formally referred to as Wrought Iron BS1740), EN 10241 & EN 10255

Alternative terminology:
Socket, Coupling, Connector, Joiner, Straight, Mild Steel, Carbon Seel, Wrought Iron, Heavy Weight, Threaded, Screwed, Fittings.