Waterway pumps often have a “leaf trap” in front of the “pump”. Homeowners describe this as a “pre filter”, “basket”, or just plain “pump”. The see-through lid has been re designed, however, they are interchangeable.
There is a small decal on the center of the lid. It may have a “W” on it, or it may be an American flag. Both have part numbers on them, however, the numbers are for the decal itself not the lid.
808-3150.1008 and 808-3150.0413 are part numbers for decals.
Since 2014 the replacement lid part number is 319-4100
http://waterwayparts.com/WATERWAY-TRAP-LID-319-4100/
The “new ” lid is two pieces and easier to remove. Again, they are interchangeable and both require the exact same o-ring 805-0436