Has maximum strength and rigidity. Constructed of very strong polycarbonate and treated with an ultraviolet stabilizer to help reduce deterioration from the sun’s rays. Material is very rigid, minimizing bending of the unit when it is full of liquid. Durable in cold temperatures and can withstand heat up to 138°C. Blue tape marks 1 ft. sections on the 3/4” diameter tubing. Made up of three 5 ft. sections (top, extension, bottom). Additional sections can be added if required.