Introduction

This specification was prepared by WRc plc under
the direction of the Water Services Association/
Foundation for Water Research Sewers and Water
Mains Committee in consultation with the Water
Industry and Fittings Manufacturers. It has been
updated to take account of the introduction of
European Standards, changes in water quality
requirements and to reflect current practice with
regard to quality assurance. The properties required
for mechanical fittings for use with polyethylene pipe
conforming to WIS 4-32-03 and/or WIS 4-32-13, for
the conveyance of cold potable water are defined.
Such fittings may be made of metal, plastics or a
combination of both.

These fittings are designed for jointing pipe to pipe
and pipe to metal fittings such as valves, tees and
bends as well as for effecting repairs.

Caveats

This document has not been reviewed for its continued currency since publication.

The Board believes WIS 4-24-01 has been replaced by European standards. There is evidence the water industry recognises this. For example: UUCESWI (i7) (unitedutilities.com) says ”Replace ‘WIS 4-24-01’ with ‘BS 8561, BS EN 12842 or BS EN 14525 as appropriate”.

The document has therefore been archived.