New Bluewave 4-Ft Step Water Bags Pair These handy 4-foot water bags fill the gaps left on the short side of your pool steps to ensure that the cover stays in place. Our step bags are made of heavy gauge vinyl with quality no-leak valves that are easily filled with a garden hose. 4-ft single tube. Features Pool cover water weight Rugged 18 gauge vinyl construction Halkey Roberts no leak valves Measures 4-ft long Easily fills with garden hose For use with in-ground pool covers