Here is a close up of the track built into the pool wall of an encapsulated track application, vinyl liner pool, cover open.  The track is just above the white of the liner.  Copyright Ellis Pool Covers, 2003.

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Ellis Pool Covers Inc. ◦  Sales, service, and local distributor of automatic swimming pool covers in Southeastern New England, (Massachusetts) USA ◦  14 Roberts Road Plymouth MA USA, 02360 ◦  (508) 746 1701 ◦  Fax (508) 746 1702