ríðr

Rör is the Swedish term for a pipe or tube—a hollow cylindrical conduit used to convey liquids, gases, or slurries. The word covers a broad range of products found in plumbing, heating and cooling systems, industrial machinery, laboratories, and drainage networks. Rör can be rigid or flexible and may be made from metal, plastic, or composite materials. Examples include water supply pipes and drainage rör.

Common materials include copper, steel and stainless steel, and plastics such as PVC, CPVC, PEX and HDPE. Some rör are insulated or multilayered for thermal efficiency. They are joined with threaded fittings, soldering or brazing, crimp or compression fittings, or solvent-welded joints, depending on material and application.

Sizes are specified by diameter and wall thickness, with metric dimensions used in Europe and most of the world. Domestic plumbing typically uses small diameters ranging from about 8 to 40 mm, while larger rör are used in heating systems, industrial piping, or municipal networks. Fittings include elbows, tees, couplings, and valves. Installation follows national or industry standards to ensure safety and leak-free operation.

Linguistically, rör is a neuter noun with the plural forms rör (indefinite plural) and rören (definite plural). The term also appears in compounds such as rörsystem (pipe system), vattenrör (water pipe) and avloppsrör (drain pipe).