This suction cover is part of the HydroAir / Balboa Standard suction. The grille is an important safety device, as it prevents the possibility that a swimmer may get stuck against the suction point by the force of the pump. 

If a grate breaks, it must be replaced immediately.

Thanks to its central screw thread which is part of the suction cover, it can be fixed on a wall fitting in either the standard or long version depending on your specific installation.

A stainless steel screw is supplied with the cover to ensure that it is not removed by the spa users.