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

The Harmer Detail Balcony outlet is designed for use with concrete balcony structures. It is fitted with flat grates for safe drainage in pedestrian accessed areas. It directly connects to cast iron pipework via suitable coupling or to PVC O-ring socketed pipe (3BO and 4BO outlets only).

General information


Aluminium: Cast in grade LM6 aluminium silicon alloy

Gunmetal: Cast in 85/5/5/5 leaded gunmetal

Specification data

Product Reference

Harmer Detail Balcony outlet


2BO, aluminium body, 50 mm pipe

2BO/GM, gunmetal body, 50 mm pipe

3BO, aluminium body, 75 mm pipe

3BO/GM, gunmetal body, 75 mm pipe

4BO, aluminium body, 100 mm pipe

4BO/GM, gunmetal body, 100 mm pipe

As drawing ___

Contractor's choice


Not required

BO/EP balcony grate extension piece, aluminium

BO/EP/GM balcony grate extension piece, gunmetal

As drawing ___

Contractor's choice

Standard product features


  • Aluminium: Cast in grade LM6 aluminium silicon alloy.
  • Gunmetal: Cast in 85/5/5/5 leaded gunmetal.

Dimensions (visible):

205 x 186 mm.

Pipe diameter:

  • 2BO range: 50 mm.
  • 3BO range: 75 mm.
  • 4BO range: 100 mm.

Flow rate:

  • 2BO range: 1.69 L/s.
  • 3BO range: 4.97 L/s.
  • 4BO range: 8.41 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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