Yamitsu 2" 50 mm multi fit hose tail.

This multi fit hose tail fits inside 50 mm hose, the other end fits in to a 56 mm solvent fitting and the inside is a 1.5" BSP female thread, hence multi fit.

It can be used to turn a 1.5" bsp male threaded pump to a 50 mm 2" hose or glued in to a 56 mm 2" tank connector to fit hose to it, etc.