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    21 ft Round Pool Overlap Liners

      21 ft Round Pool Overlap Liners is rated 4.4 out of 5 by 8.
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    21' Round Overlap Liner Freshens Your Pool’s Looks

    Choosing a new liner is an important decision, after all you are going to be looking at it for many years! In The Swim’s 21 foot round overlap liners offer exceptional durability, popular patterns and a value price. Choose between several liner thicknesses and eye-catching designs to make your pool toast of the town this summer!

    Made of 100% virgin vinyl, this 21' overlap pool liner is ready to install. Each liner undergoes quality control with inflation and light testing, to ensure a near-zero defect rate. Overlap liners drape over your pool walls, held in place with coping clips beneath the top rail.

    Double welded seams deliver superior resistance to wear and tear, and the super-strong virgin vinyl resists fading and damage from the sun’s UV rays and harsh weather. Our patterns are printed with the most advanced methods and our seams are virtually invisible. In The Swim pool liners are made in the USA, from the largest fabricators in the country.

    • Round overlap liner for 21 foot diameter pools with flat bottoms and 48 in. or 52 in. sidewalls
    • Choose between a number of attractive designs and patterns or solid blue
    • Super-strong virgin vinyl delivers exceptional durability; comes in 20, 25 and 30 gauge thickness
    • Double welded seams won’t separate, resist wear and tear
    • Overlap pool liner secured by pool’s top rail, can be held in place with Cover Clips
    • Our 20 gauge overlap liners are backed by a 15 year warranty
    • Our 25 gauge overlap liners are backed by a 25 year warranty
    • Our 30 gauge overlap liners are backed by a 25 year warranty
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      • Item: # L1020A Solid Blue - 20-Gauge Overlap $143.99
      • Item: # L1220A Solid Blue - 25 Gauge Overlap $204.99
      • Item: # L1408A Solid Blue - 30 Gauge Overlap $229.99
      • Item: # L1020B Swirl Floor - 20-Gauge Overlap $193.99
      • Item: # L1220B Swirl Floor - 25 Gauge Overlap $351.99
      • Item: # L1020C Boulder Swirl - 20-Gauge Overlap $224.99
      • Item: # L1220C Boulder Swirl - 25 Gauge Overlap $302.99
      • Item: # L1020E Rolling Wave - 20 Gauge Overlap $259.99
      • Item: # L1020D Blue Stone - 20-Gauge Overlap $285.99
      • Item: # L1020F Caribbean - 20-Gauge Overlap $280.99
      • Product Description
      • Customer Review
      • MORE INFO

      Constructed of super-strong virgin vinyl, the 21 foot round pool liner comes in different gauges of thickness to fit your needs and your budget. Double welded seams resist wear and tear while the vinyl fabric is treated to resist chemicals and UV rays. Above ground overlap liners are easy to install – see our Liner Accessories page for liner installation supplies.

      • Above ground overlap liners are made from virgin vinyl that is super strong and resistant to UV rays and pool chemicals
      • Create more excitement in your pool with different colors and eye-catching designs to choose from
      • Double welded seams provide long-lasting durability that won’t easily break down from wear and tear
      • Three different gauges of thickness are available
      • Flat bottom liners will fit pools with 48 inch and 52 inch high walls
      • The 21 foot round pool liner is simple to install, new liner coping strips are recommended

      Rated 5 out of 5 by from Great pool liners Great products for above ground pools from this vendor
      Date published: 2019-05-23
      Rated 5 out of 5 by from Good quality pool at a great price Needed a new liner and they had what I needed on sale
      Date published: 2016-09-24
      Rated 5 out of 5 by from Great liner Bought this liner three years ago. It is holding up very well and still looks beautiful. Handles the winters very well.
      Date published: 2016-06-23
      Rated 5 out of 5 by from Great pool liner I ordered the Boulder swirl pool liner. It is very good quality and also not to mention very pretty.
      Date published: 2016-05-18
      Rated 5 out of 5 by from Great color! Bought bolder swirl liner three weeks ago. It came to my home in one day love the fast delivery! The two shades of blue in this liner are beautiful.
      Date published: 2015-07-01
      Rated 4 out of 5 by from Pretty pleased I installed this liner this past weekend. All in all- as far as liners go- it was not too difficult. As with all liners you must assure that the seam between the floor and the wall is evenly positioned around the entire circumfrence on the pool, not only to maintain the intergrity of the liner- but to make sure your pattern on the wall is symmetrical all the way around the pool top. Follow instructions carefully and you will be very pleased with the finished product. I recommend once you get the liner opened in the pool bottom- to fold the walls inward so that you can see the floor seam- then with a few people in the pool- guide the seam evenly around the floor / wall junction until it is as centered as possible. The begin working the walls of the liner up and set them into place temporarly - you will need to continue to adjust as the water level increases. Do not begin filling the pool until you have removed as many creases from the floor as possible- then once you begin to fill- stay in the pool so that you can continue to work out little creases here and there- i used a broom for this part- once you get to 1 inch or so of water - you are pretty much stuck- it is worth it to take your time on this step especially. Start in the center of the pool and work your way out and around. As the water level works its way up the pool- continue to work the walls to elimiate bubble and creases. Good Luck!
      Date published: 2013-05-06
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      Installation Instructions
      • 2” gray duct tape with non-asphalted adhesive
      • screwdriver
      • garden hose
      • sharp nail or ice pick
      • industrial vacuum or household vacuum (filter bag removed)
      • tamping tool
      • masking tape
      • utility knife

        WARNING: Liner should be stored at room temperature for at least 72 hours prior to installation.


      1. Spread a 2” layer of brick sand over the entire pool foundation area inside the base rails. Use a rake to make the brick sand flat and smooth. Tamp sand to help reduce footprints. In place of brick sand, you can use “Soft Step” Floor Padding. Cut the sheets to fit and join them with duct tape along the whole length of each seam.

      2. With the brick sand, make a curved cove about 4” high and 4” wide all around the bottom of the pool wall on the inside. Pack firmly into shape. Pool Cove can also be used.


      1. Place the closed liner carton in the center of the pool.

      2. Open the carton. Do NOT use anything sharp to open the carton.

      3. Unfold the liner and spread it out in the sun to warm up.

      4. Inspect all seams and surfaces for holes.

      5. Spread out liner. The curved seam should be centered on the cove at the base of the wall. The other seams will form straight lines across the bottom of the pool. If seams appear to have flaps, check to see if correct side is up.

      6. Smooth out all wrinkles in the bottom.

      7. If you have a beaded liner, fasten the liner in place by lifting the sides of the liner and inserting the beaded edge into the liner retainer on the top edge. If you do not have a beaded liner, lift the sides of the liner and drape them over the top of the pool wall. Fasten liner to the top of the wall with plastic coping. Let the liner hang slack for now. Do NOT pull liner tight.

      8. Start filling the pool with water. As the pool fills, work out the wrinkles and smooth the liner to the wall. Remove the plastic coping around the top edge of the wall one piece at a time and adjust the liner. Keep smoothing out the wrinkles.

      9. Do not install faceplates, inlets, light fixtures, etc. until water reaches 3” below each opening. Premature installation might result in the liner tearing away from the opening due to stretching as the water level increases.

      10. Proceed filling pool until water reaches desired level.


      1. To remove air from behind the liner, which prevents wrinkles, insert a vacuum cleaner hose through the skimmer hole in the pool wall behind the liner. To minimize vacuum loss, seal the opening around the hose and the water inlet using cardboard and masking tape.

      2. Turn vacuum cleaner on. While vacuum is running, you should be adjusting the liner with short tugs to eliminate wrinkles. If you have trouble shifting the liner into position, shut vacuum off for a few minutes. You should then be able to adjust the troubled area before continuing with the vacuum.

      3. Start filling the pool with water. The vacuum cleaner should continue to run until water level nears the top. Make sure to keep vacuum cleaner hose above the water level at all times.
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