Mine does but I mounted mine in a position where I can't see the water level indicator (as I like easy access through side loading door), so I cut out two large holes and fitted two screw in lids, screwed in and no more nails waterproof silicon sealant around the lids so watertight. Tank is insulated so come winter I can drop an aquarium heater in both holes to act as a radiator to keep water warm and stop it all freezing up.