1.5" bsp male threaded hose tail,fits in to any 1.5" bsp female threaded fitting,such as some pumps and UV's also nuts are availble to fit through tasnks etc.

3 step Fits on hose sizes 1"/25mm, 1.25"/32mm and 1.5"/38mm

5 step fits the above plus 1/2"/13mm and 3/4"/19 mm