Depth Above Ground Pool Liner, Depth. The Liner is made with excess material so it can fit on the common 48 or 52 walls. ZODIAC Check Valve Kit with Flapper Assembly for and Jandy CPVC. Swimline overlap 27' round blue 48/52 in. depth above ground pool liner, depth with the finest and largest inventory in the industry, quality swimline pool liners are available for round and oval above ground pools.