1st. is skimmer during normal operation.
2nd. is skimmer with cup removed, and the neck which is attached to the cup. Skimmer is left running which helps clean the air injection system, although I usually cover it with a small lid to keep the spray down.
3rd. is the cup with attached neck. Just dump and clean with my brush. It just sits back in, no thumbscrews, locking thingys or other devices.
