It is recommended to use 4-inch tube kit for pool 600-square feet and larger or when using thicker mil solar blankets. Product Dimensions: 1 x 1 x 1 inches. The item "GLI 55-0000TY-BK Typhoon Inground Pool Solar Reel Resin System Base Kit" is in sale since Friday, March 9, 2018. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Pools & Spas\Pool Equipment & Parts\Pool Covers & Rollers".The seller is "e-z_test_pool_supplies" and is located in Plaistow, New Hampshire. This item can be shipped to United States.