Shurtrax SHULW0036 LW-0036 All Weather Traction Aid for Auto/SUV Safely adds traction weight to your car or SUV via a vinyl unit filled with water Simple to install and remove; includes a siphon pump and universal fit hose connector for no-spill filling and draining Your trunk stays clean -- a continuous outer seal, heavy vinyl exterior and tie-down grommets keep the unit in place and intact ShurTrax is made to freeze and has been tested to minus 40 degrees without bursting 3 year warranty against defects in material or workmanship