I think the pic Cleancloths posted is mine:

Sta Rite 8" Anti Vortex 0712-0741

Manufacturer: Sta Rite

Maximum Flow, ANSI/ASME A112 Rating
60 GPM

This cover is A112 approved at 60 GPM

The Sta Rite cover is flat on the top with a circle in the center. Water is drawn in on the elevated sides..

_________________

If the valve were open, I would not be able to feel water being pulled in? SO maybe mine is open after all? I'll dive down this weekend with a vial of dye to see, just for the heck of it.