Some of you asked about the neck of the skimmer and how the cup attaches... in this close-up you can see the silicone ring that is recessed inside the neck. The inside tube of the cup extends slightly (1/2") and fits down inside the black ring. Its snug and I expect the silicone ring will need to be kept clean and and lubricated to make it easy to get the cup off when needed. The cup does have a built in drain. Note the thickness of the black ring and the quality of the routing and finish work. Very good IMO.
