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Aquarium plumbing [Metric]
Metric solid piping is specified by the external diameter of the pipe and socket fittings are measured by the internal size of the plain socket.
Therefore, as an example: 25mm pipe will fit a 25mm elbow.
All socket fittings require to be bonded with a good gap filling solvent.
Please do not use a standard PVC solvent as these are not drinking water safe.
All solvents supplied by ourselves, when dry are safe for Aquarium/Pond use.