Puddle Flange - PE Puddle / Weep Flanges: Ductile Iron

A puddle flange is a fitting used on polyethylene (PE) pipelines to act as a restraint point, stopping water from tracking along the outside of the pipe where it passes through a wall, slab, or structure. Derwent Industries’ puddle flanges are cast in ductile iron and are 100% Australian made.

Puddle flanges are used to anchor and restrain PE pipe at a fixed point in a pipeline — typically where the pipe passes through concrete, at a change of direction, or wherever restraint is needed along the run. They prevent movement of the pipe and stop water migrating (or “puddling”) along the pipe wall at that point.

In Derwent’s range, “puddle flange” and “weep flange” refer to the same ductile iron fitting — it’s listed as a combined PE Puddle / Weep Flange. Functionally, it restrains the PE pipe at a set point while also managing water at that junction, which is why both terms are used for it interchangeably in the water industry.

Derwent’s puddle flanges are manufactured to meet Australian Standards and hold StandardsMark Product Licence No. SMK1989. They’ve also been tested and approved in accordance with City West Water testing requirements, and carry WSAA and WaterMark recognition.