GLI 55-2003IG-TK Inground Reel Pool Cleaning Tube Kit, 3-Inch by 20-Feet This heavy duty aluminum tube kits are predrilled for easy installation and includes all necessary hardware Fits typhoon, cyclone, monsoon and hurricane molded GLI reel systems It is recommended to use a 4-inch tube kit for pool 600-square feet and larger or when using thicker mil solar blankets Larger 4-inch tube will reduce sag 3-Inch diameter tube kit useful for in ground pool up to 20-feet wide