Polyethylene plastic tanks are among the most durable rainwater storage solutions around. Seamless construction and high UV protection makepolyethylene plastic tanks ideal for both above-ground and below-ground storage needs. RMS haspoly water tanks for sale that will suit any capacity. For small residential projects, see our 305-gallonpoly storage tank, while larger commercial applications will be interested in our12,000-gallonpoly tanks. Get the best inpolyethylene plastic tanks from RMS.