Upward 400 Measure Your Pool Drain Connection for 1.5 Inch or 2 Inch Hose One 15" x 1.5" Extra Heavy Duty Reinforced Backwash Hose Safe for Your Lawn with a Properly Maintained Pool Water [Eco Pool Drain "Fountain"] Used with w/ Sand & Cartridge Filters to Lower Pool Water/ Backwash Filt Warning: This Product is not to be used with DE Filtration Systems!