Swimline LI1833SB Oval Swirl Bottom Overlap Above Ground Liner - 18 ft x 33 ft, 48 in to 52 in Wall

What This Part Is Used For
This overlap liner replaces the interior vinyl surface of an 18 ft x 33 ft oval above ground pool with 48 in to 52 in wall height. It installs by overlapping the wall and securing beneath the top rails. It becomes the waterproof interior barrier that holds pool water against the wall and floor.

Why This Part Matters
Oval liners must be properly sized and evenly installed to avoid wrinkles and stress points along long wall runs. A failing liner can lead to ongoing leaks and water intrusion that damages the pool wall structure. The correct overlap liner supports a clean set during fill and helps prevent premature seam wear.

Key Features and Specifications

• Manufacturer part number: LI1833SB
• Oval above ground pool liner
• Pool size: 18 ft x 33 ft
• Fits 48 in to 52 in wall height
• Overlap installation style
• Swirl Bottom pattern

Installation and Fitment Guidance
Confirm the pool’s oval size and wall height range before ordering and installation. Keep the liner centered and secured evenly under the top rails to prevent shifting during fill. Confirm by manufacturer part number before ordering.

About the Swimline Brand
Swimline supplies liners for standard residential above ground pools in both overlap and unibead styles. Their overlap liners integrate with common top rail systems without requiring bead receiver tracks. Swimline products are commonly used in seasonal maintenance routines like spring openings, liner replacements, and pool refresh projects.

Common Service Context
This liner is typically installed when the existing vinyl shows brittleness, seam leaks, or heavy wrinkling that will not reset. Overlap liners are often identified as the best fit for pools that lack bead track hardware.