Our cover is used to protect your swmming pool&spa &hot tub &bathtub and avoid steam loss and keep ... Our product line is spa cover ,outdoor spa cover, hot tub cover ,bathtub cover, swim spa cover, swimming pool cover ,lifter for cover ,PVC water pipe and related ... and corrosion proof, ensuring structural integrity for the life of cover.5) Corrosion Proof Nylon Zipper: Large #8 zipper with protective ...