The liner is a replacement for 17 ft. x 10 ft. x 42 in. Power Steel Swim Vista Series steel frame oval above ground pools. The sturdy Tritech liner is made out of an ultra-durable 3-layer material that is reinforced for strength and puncture-resistance. This liner features 2 built-in portholes for an interactive, underwater adventure. Simply detach your current liner from the frame and attach this one for quick and easy setup.