the grating 12 can be positioned above below or at the same level as the uppermost surface of the ring 32 in one arrangement not shown a section of the side portion 20 of the grating 12 can extend below the underside of the ring 32 so that fluid flowing through secondary fluid apertures 41 can also pass through the side portion 20 0036 fig7 shows the cover 10 attached to a drain 16 the cover 10 may be attached to a drain 16 in any suitable manner for example a portion of the cover 10 may be mounted to the drain 16 with any suitable mechanical or chemical fastening structure such as screws bolts nails or adhesive to receive such a suitable fastening structure one or more holes 46 can be provided in the ring 32 of the base 14 as shown in fig4 although fig4 shows the base 14 as containing eight holes 46 the invention is not limited to this particular embodiment as the base can contain any suitable number of holes 46 as shown in fig5 the holes 46 can be positioned on the base 14 such that the holes 46 pass through one or more protrusions 40 such an arrangement can provide extra support to the base 14 as a greater portion of the base 14 can be engaged by the suitable.