This Watts Spa Flex Tubing is PVC compounds reinforced with a rigid PVC spiral helix making spa-flex stron. flexible, and easy to handle. It con.orms to any shape or con.our, and is specifically sized to be glued over barbs or into standard PVC fittings. This tubing is a superior choice for spas, jetted tubs, whirlpools, or other open systems. The rugged construction makes this equally useful as a light suction.or vacuum discharge hose.