Intex swimming pool adapter to a rubber hose

A friend of mine owns an Intex swimming pool and, due to his need, he needed to connect a rubber hose to create a recirculation of the water that was sucked up from the bottom of the swimming pool.
not finding anything commercial that I could adapt, I created this fitting for him.

On the "adattatore piscina" piece there are two seats to house two O-rings with an external diameter of 24mm and a thickness of 2.4mm.