The receptacle/plug is in an outside box with an in-use cover - code in my town for all new outside recptacles.

The Bonding screw is how you attach the pool's bonding system to the pump.

Bonding is a little different than grounding. A pool's bond is intended to ensure that everything conductive in and around the pool is kept at the same electrical potential(voltage). The idea is that the bond wire carries any electrical current that mat be present in and around the pool instead of swimmers making the circuit. Grounding provides a path for electricity in the event that the electrical insulation in a piece of equipment should fail.