Heavy-duty, durable polyethylene elbow. Used in conjunction with a barbed elbow and poly pipe (sold separately) so sprinkler heads can be set in a vertical position for better spray coverage. Ideal for use with PVC (polyvinyl chloride) and poly pipe systems. Allows free movement in any direction when connected to other components. Used to make swivel assemblies for sprinkler head risers. Not to be used under continuous pressure. MNPT x FNPT threaded connections. For outdoor use with cold water only.