1/4 I.D. x 3/8 O.D. x 20" polyethylene toilet riser. Serves as replacement for flexible copper risers. Easily installed. Can be cut with a knife. Won't kink. Ferrule included on each tube. Use with CPVC and universal fittings, standard 3/8" brass compression, flare fittings or patented Genogrip adapters.