Harmer Roof AV Retro-Gulley outlets incorporate anti-vortex performance and are designed for flat roof upgrading without necessitating removal of the old rainwater outlet. The Retro-Gulley aluminium tail pipe connects directly into the existing pipework via the old outlet. Harmer Roof Aluminium is a high performance rainwater drainage system suitable for all types of flat roof application. The Harmer AV range provides advanced flow characteristics for optimum rainwater disposal. Outlets for specific applications, such as two-way, car park and balcony outlets, can be found under the Harmer Detail range.
Please note that these product properties are not a replacement for the manufacturer's literature and it is always recommended that Harmer Drainage Systems is consulted before specifying.
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| Material (?) | Aluminium | |
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| Connections (?) | 75 mm | |
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| Uniclass (?) | Pr_70_55_98 Water inlets and outlets | |