. . Right, reducing, steel hexagonal nipple for wrench, with thread G 5/4"- G 6/4".Applied in hydraulic power applicationsBASIC DATAMaterial: steelThread I: male thread G 5/4" (according to BSPP¹)Thread II: G 6/4" male thread (according to BSPP¹)British Standard Pipe Parallel - British Standard Pipe Parallel, inch cylindrical thread, one of the Whitworth Pipe Threads (BSP) denoted by the letter G.All photos in this auction are review photos..