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Established 1893   |   BS 460:2002 Certified   |   UK & International Supply   |   Expert Technical Support   |   0333 987 4452

Shop / Cast Iron Gutters & Pipes / Cast Iron Round Downpipes / Cast Iron Round Downpipe Offset – 115mm (4.5″) Projection
Cast Iron Pipe Offset Swan Neck
How to measure the projection of a cast iron round downpipe offset, centre line to centre line
CODE RWOS4.5 Category Cast Iron Round Downpipes

Cast Iron Round Downpipe Offset – 115mm (4.5″) Projection

£69.40 – £148.10Price range: £69.40 through £148.10 ex VAT (£83.28 – £177.72 inc VAT)

Our cast iron round rainwater pipe offset 115mm and cast downpipe offset is suited to most period property renovations. Round cast iron pipe is available in primed and black as standard.
Sizes Available:

65mm (2.5″)
75mm (3″)
100mm (4″)

Cast iron round rainwater pipe offset 115mm (4.5″): R2541, R3041, R4041, XR2541, XR3041, XR4041

Our traditional cast iron rainwater pipe is available in 4 sizes. It is now common to see 2.5″ pipes used in place of the older 2″ sizing.

Measuring the projection: measured horizontally between the centre lines of the upper and lower pipe, not face to face. See the measuring diagram in the gallery, or our guide to measuring an offset for all sizes and a worked example.

Clear

UK delivery from £30. Fittings are despatched boxed. See delivery rates.

Our traditional cast iron rainwater pipe is available in 3 sizes. It is now common to see 2.5″ pipes used in place of the older 2″ sizing.

Cast iron gutters and pipes offer great strength and durability, a proven history of long life, low noise operation and fire resistance. Most old buildings have cast iron rainwater systems that should be maintained and preserved however; these inherent benefits make a cast iron rainwater system an ideal choice for both traditional and modern installations.

Technical

For specific technical sizes on our range of cast iron gutters, rainwater pipes or UK manufactured brackets for cast metal rainwater products.

Additional information

Pipe Size/Finish

Primer 65mm, Primer 75mm, Primer 100mm, Black Painted 65mm, Black Painted 75mm, Black Painted 100mm

FAQ Categories

  • Cast Iron Airbricks
  • Cast Iron Airvents
  • Cast Iron Hopper Heads
  • General
  • Gutter & Pipe Brackets
  • Gutters & Pipes
  • Heating
  • Rooflight Openers
  • Soil Pipes
All FAQ
What finishes are available on your cast iron hopper heads?

What finishes are available on your cast iron hopper heads?

Hopper heads are supplied in red oxide primer ready for on-site painting, or pre-finished in black. A full range of Heritage Colours in traditional linseed oil paint is also available on request — please contact us for the swatch chart.

What sizes are available for the School Board Airbrick?

What sizes are available for the School Board Airbrick?

The School Board Airbrick (F020801AFC) is available in three standard sizes: 225mm × 75mm, 225mm × 150mm, and 225mm × 225mm. These correspond to one-, two-, and three-brick-course heights and allow ventilation requirements to be met across a range of subfloor and wall opening sizes.

Do you supply cast iron guttering for churches and ecclesiastical buildings?

Do you supply cast iron guttering for churches and ecclesiastical buildings?

Yes. Churches and ecclesiastical buildings are one of our most common project types. We regularly supply large sand cast gutters, rectangular and square downpipes, and bespoke hopper heads for church restorations. Many churches have non-standard profiles that require copy casting. We work directly with architects, church fabric advisors, and quinquennial inspection surveyors. Historic England and many Diocesan Advisory Committees specify cast iron as the appropriate material for listed ecclesiastical buildings.

Is a chrome rooflight opener compatible with Lumen Rooflights?

Is a chrome rooflight opener compatible with Lumen Rooflights?

Yes. Both the satin and polished chrome telescopic rooflight hand winder openers are compatible with Lumen Rooflights and most timber-framed skylights. Call 0333 987 4452 if you need to confirm compatibility with a specific model.

Where should access pipes be fitted on a downpipe?

Where should access pipes be fitted on a downpipe?

At the foot of each stack above the shoe or gully, directly above offsets and bends, and below hopper heads where trees overhang the roof. On tall or long runs, an extra access point part-way up makes clearance easier.

What cast iron gutter profile do I need for a Victorian property?

What cast iron gutter profile do I need for a Victorian property?

Victorian properties most commonly used Ogee (OG) gutter profiles, including the standard Cast Iron Ogee and the G46 Moulded Ogee. Half Round guttering was also widely used, particularly in the later Victorian period. The correct profile depends on what is already present on the building — we recommend inspecting any surviving sections and matching the profile, size, and socket direction exactly. We supply 19 standard gutter profiles and can copy-cast any non-standard profile from a drawing, photograph, or physical sample.

Do I need listed building consent to replace cast iron guttering?

Do I need listed building consent to replace cast iron guttering?

In most cases, replacing like-for-like cast iron guttering on a listed building does not require Listed Building Consent (LBC), provided the replacement matches the existing profile, material, and finish exactly. However, any change of material away from cast iron will almost always require consent. We recommend consulting your local conservation officer before proceeding, and we can provide specification documentation to support your application if required.

What rooflights is the 1520mm brass opener handle compatible with?

What rooflights is the 1520mm brass opener handle compatible with?

The handle is compatible with Lumen Rooflights and most pole-operated rooflight and skylight systems. If you are unsure whether it suits your specific rooflight, call us on 0333 987 4452 and we can advise.

What building types is the H527 cast iron hopper head suited to?

What building types is the H527 cast iron hopper head suited to?

The H527 measures 430mm wide x 195mm deep x 540mm high, making it well suited to Victorian villas and townhouses where a decorative leader head is wanted.

Do I need an eared or plain access pipe?

Do I need an eared or plain access pipe?

Match the rest of the run. Eared access pipes are nailed to the wall through cast ears, like eared downpipe lengths. Plain access pipes suit runs fixed with holderbats or earbands.

Related products

  • Cast Iron Round Rainwater Downpipe Shoe Plain

    Cast Iron Round Downpipe Shoe – Plain

    £64.20 – £97.90Price range: £64.20 through £97.90 ex VAT (£77.04 – £117.48 inc VAT)
    Select options This product has multiple variants. The options may be chosen on the product page
  • Cast Iron Pipe Offset Swan Neck

    Cast Iron Round Downpipe Offset – 457mm (18″) Projection

    £220.90 – £354.20Price range: £220.90 through £354.20 ex VAT (£265.08 – £425.04 inc VAT)
    Select options This product has multiple variants. The options may be chosen on the product page
  • Cast Iron Round Pipe Socket Plain

    Cast Iron Round Downpipe Loose Socket – Plain

    £27.10 – £48.70Price range: £27.10 through £48.70 ex VAT (£32.52 – £58.44 inc VAT)
    Select options This product has multiple variants. The options may be chosen on the product page
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Find out more about our products by giving us a call
0333 987 4452

Tuscan Foundry Products, Tyn-Y-Clyn, Llanafan Fawr, Builth Wells, Powys LD2 3LU, United Kingdom

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