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A drain cover for a swimming pool, spa or tub drain that includes a hollow tube or shell having a slot formed in a wall therein and a fitting connecting the drain cover with respect to the drain.

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We claim: 1. A drain cover for a pool drain comprising: a fitting and a shell adapted to be positioned over the pool drain; the shell forming a domed profile having only one slot formed within the profile of the shell, the shell thereby divided into two separate and opposing parts, a first part of

We claim: 1. A drain cover for a pool drain comprising: a fitting and a shell adapted to be positioned over the pool drain; the shell forming a domed profile having only one slot formed within the profile of the shell, the shell thereby divided into two separate and opposing parts, a first part of the two separate and opposing parts having a maximum first height measured from the fitting to the tip of the domed profile along the surface which forms the slot relative to the fitting, and a second part of the two separate and opposing parts having a maximum second height measured from the fitting to the tip of the domed profile along the surface which forms the slot relative to the fitting, said maximum first height and maximum second height have different heights such that the two separate and opposing parts forming an offset configuration with one another relative to a surface in which the pool drain is positioned. 2. The drain cover of claim 1 further comprising: a plurality of projections formed along one or more surfaces of the opposing parts. 3. The drain cover of claim 1 further comprising: a plurality of ribs formed along the opposing parts of the shell that form the slot. 4. The drain cover of claim 1 wherein the shell is significantly larger than the drain so as to preclude the covering of the slot by the body of a swimmer. 5. The drain cover of claim 1 wherein the shell forms a spherical section. 6. The drain cover of claim 1 wherein the slot has a width greater than 1 inch. 7. A drain cover for a drain comprising: a shell and a fitting positioned over the drain, the shell forming a domed profile having only one slot slot formed within the profile of the shell thereby dividing the shell into opposing parts, and a plurality of projections formed along one or more surfaces of the opposing parts, said opposing parts having different maximum first height and maximum second height relative to a surface in which the drain is positioned. 8. A drain cover for a pool drain comprising: and a fitting positioned over the pool drain, the shell forming a domed profile having a slot formed within the profile of the shell, the shell thereby divided into opposing parts, the opposing parts having different maximum first height and maximum second height relative to a surface in which the drain is positioned, and a plurality of ribs formed along the opposing parts that form the slot.