Harmer Detail is a range covering all the awkward detailing situations that occur in new building design and refurbishment.

The Harmer Roof Detail Gulley outlet is for use in roof constructions incorporating formed drainage channels. It is specially designed to suit restricted width gulleys which are too narrow for standard outlets. It directly connects to cast iron pipework via suitable coupling or to PVC O-ring socketed pipe.

General information


Cast in grade LM6 aluminium silicon alloy

Specification data

Product Reference

Harmer Detail Gulley outlet


3GO, aluminium body, 75 mm pipe

3GO/GM, gunmetal body, 75 mm pipe

4GO, aluminium body, 100 mm pipe

4GO/GM, gunmetal body, 100 mm pipe

As drawing ___

Contractor's choice


Not required

GO/EP gulley grate extension piece, aluminium

GO/EP/GM gulley grate extension piece, gunmetal

As drawing ___

Contractor's choice

Standard product features


Cast in grade LM6 aluminium silicon alloy.

Dimensions (visible):

Width: 188 mm.

Pipe diameter:

  • 3GO range: 75 mm.
  • 4GO range: 100 mm.

Flow rate:

  • 3GO range: 4.97 L/s.
  • 4GO range: 10.41 L/s.

Product Options


– Grate extension piece:

  • For applications where it is necessary to raise the level of the grate above the body of the outlet, e.g. inverted roof construction. Extension pieces can be cut down if necessary to suit thickness of paving or tiles.

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