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Industry leading
Our sales and technical team have over 20 years’ experience working with the industry leading rainwater systems available in the UK. -
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Premium quality
Our aluminium, steel, cast iron, plastic & GRP rainwater systems are all sourced from the leading manufacturers in the UK to ensure they are of the highest quality.
Harmer Roof Cast Iron Outlets

Harmer Cast Iron Roof outlets provide a practical solution to many building drainage applications. Inherently strong, cast iron is an ideal choice for load-bearing applications.
Applications
- The medium sump range is a compact outlet body in vertical and horizontal varia-tions
- The large sump range provides a deeper sump for 100 and 150mm vertical pipe
- Two way outlet is suitable for use in a parapet wall construction
- Provide flat roof drainage for warm, cold and inverted roofs
- For flat roof structures with insitu cast concrete, timber or lightweight metal deck construction
- Ideal for use with copper and lead clad roofs where the risk of bi-metallic corro-sion is high
- Load bearing applications where rainwater outlets are exsposed to vehicular traffic and ideal for connection to continuous water
Performance
- The Harner cast iron range is cast to BS EN 1561 and are suitable for most types of flat roof drainage
- Designated load rating up to 12.5 tonnes
- Medium and large sump outlet bodies are available with varying flow rate capacity
- Cast iron has a proven track record for its longevity over the lifetime of the building
- Cast Iron is 100% recyclable
Materials & Finishes
- The crystallised nature of cast iron gives the material very high strength and robustness
- Once installed cast iron components resist impact damage even in exposed areas
- All Harmer cast iron clamps & grates have a sherardizing zinc coating which provides an extremely hard wearing anti corrosive finish
- Domical grates are made from UK-stable poly-propylene to give long life service
- Two way outlet rectangular grate available in sherardized cast iron, nickel bronze or mill finish aluminium. Aluminium grates can be polyester powder coated upon request
- The outlet flanges only have a primer coating so the contractor/installer should protect or coat it during installation
If you have ANY questions about our products, or want to give us some feedback about your shopping experience with us, please feel free to contact us on 0330 2231732 or email: sales@roof2floordrains.co.uk
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Available
Harmer Roof Cast Iron Medium Sump Vertical Spigot Outlet
Cast Iron Medium Sump Vertical Spigot Outlet, available with a Dome or Flat grate in sizes 50mm, 75mm & 100mm
1
From
Price
£80.36
Ex VAT£96.43 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Cast Iron Balcony Outlet Full Grate
Cast Iron Balcony Outlet Full Grate, available in three sizes 50mm, 75mm & 100mm
1
From
Price
£66.88
Ex VAT£80.26 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Detail Push Fit Parapet Downspout
Roof Detail Push Fit Parapet Downspout, available in Cast Iron or Aluminium
0
From
Price
£186.72
Ex VAT£224.06 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Cast Iron Large Sump Vertical Threaded Outlet
Cast Iron Large Sump Vertical Threaded Outlet, available with a Dome or Flat grate in sizes 100mm & 150mm
0
From
Price
£120.29
Ex VAT£144.35 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Cast Iron Medium Sump Vertical Spigot Outlet Double Flanged
Cast Iron Medium Sump Vertical Spigot Outlet Double Flanged, available with a Dome or Flat grate in sizes 50mm, 75mm & 100mm
0
From
Price
£180.64
Ex VAT£216.77 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Cast Iron Balcony Outlet Aperture Grate
Cast Iron Balcony Outlet Aperture Grate, available in three sizes 50mm, 75mm & 100mm
0
From
Price
£66.88
Ex VAT£80.26 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Cast Iron Large Sump Vertical Screw Outlet Square Grate
Cast Iron Large Sump Threaded Outlet 323mm x 323mm Square Grate, available in sizes 100mm & 150mm
0
From
Price
£153.32
Ex VAT£183.98 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Cast Iron Medi Sump Vertical Spigot Outlet Circular Ductile Iron Adj
Cast Iron Medium Sump Vertical Spigot Outlet 220mm Circular Ductile Iron Adjustable, available with a Flat grate in sizes 50mm, 75mm & 100mm
0
From
Price
£135.05
Ex VAT£162.06 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Cast Iron Balcony Screw Outlet Full Grate
Cast Iron Balcony Screw Outlet Full Grate, available in three sizes 50mm, 75mm & 100mm
0
From
Price
£66.88
Ex VAT£80.26 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Cast Iron Detail Two Way Outlet
Cast Iron Detail Two Way Outlet, available with a Cast Iron Rectangular or Flat grate in sizes 2", 3" & 4" BSP
0
From
Price
£62.07
Ex VAT£74.48 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Cast Iron Large Sump Vertical Screw Outlet Square Ductile Iron Adj
Cast Iron Large Sump Vertical Threaded Outlet 225mm x 225mm Square Ductile Iron Adjustable, available with a Flat grate in sizes 100mm & 150mm
0
From
Price
£177.08
Ex VAT£212.50 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Cast Iron Medi Sump Vertical Spigot Outlet Square Ductile Iron Adj
Cast Iron Medium Sump Vertical Spigot Outlet 225mm x 225mm Square Ductile Iron Adjustable, available with a Flat grate in sizes 50mm, 75mm & 100mm
0
From
Price
£126.77
Ex VAT£152.12 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Cast Iron Balcony Screw Outlet Aperture Grate
Cast Iron Balcony Screw Outlet Aperture Grate, available in three sizes 50mm, 75mm & 100mm
0
From
Price
£66.88
Ex VAT£80.26 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Cast Iron Detail Two Way Outlet Aluminium Grate
Cast Iron Detail Two Way Outlet Aluminium Rectangular Grate in three sizes 2", 3" & 4" BSP
0
From
Price
£66.19
Ex VAT£79.43 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.
Available
Harmer Roof Cast Iron Large Sump Vertical Threaded Outlet Double Flanged
Cast Iron Large Sump Vertical Threaded Outlet Double Flanged, available with a Dome or Flat grate in sizes 100mm & 150mm
0
From
Price
£206.84
Ex VAT£248.21 Inc VAT
Estimated lead-time 3-5 working days.
Estimated lead-time 3-5 working days.