TUBE ANCHOR Turn your towable into a portable swim platform with AIRHEAD's Tube Anchor. While the kids are lounging or playing on the tube, adults get to enjoy a little quiet time on the boat, dock or beach! AIRHEAD's Tube Anchor bag is constructed of durable reinforced PVC/polyester tri-laminate. Simply fill it with rocks or sand and drop it into the water. The buoy has a convenient mesh compartment inside for stowing slack from the 20 foot long rope. A giant acetyl snap hook allows for easy hook ups to your tube's handle or tow strap.