Swimline 18X33 Oval Caribbean 52" Beaded Will work with 48" constant depth swimming pools. The high temperature curing, computer controlled process insures that 100% of the material is Vulcanized to the highest possible tolerances. Vacuum Sealing, high volume air pumps combined with electronic air filter remove all impurities before bonding. Lap welded seams, unlike butt-welded seams; reduce both lateral and vertical tension. 20 gauge liners are backed by a 20 year limited warranty.