Product Description

125mm VIT-Smooth One Piece Offset Pipe – Vitreous Enamel

Model: 67-125-045

The 125mm VIT-Smooth One Piece Offset Pipe provides an approximately 100mm sideways offset within a compatible single-wall stove-pipe system. It is useful when the outlet of a stove does not align directly beneath the chimney, flue liner adaptor or twin-wall flue connection.

Instead of creating the offset with several separate bends and short pipe sections, this component incorporates the change in alignment into one continuous fitting. Therefore, it creates a cleaner-looking installation with fewer visible joints.

The fitting has a short male-ended pipe section at the bottom for connection towards the appliance. It is manufactured from 1.2mm zero-carbon steel and finished internally and externally with smooth matt-black powder vitreous enamel.

125mm One Piece Offset Pipe Features

• 125mm (5-inch) nominal flue diameter
• Approximately 100mm built-in lateral offset
• One-piece construction
• Creates an offset with fewer separate components
• Reduces the number of visible flue joints
• Short male-ended pipe section at the bottom
• Designed for compatible VIT-Smooth connecting flues
• Manufacturer model number: 67-125-045
• Manufactured from 1.2mm zero-carbon steel
• Approximately 0.2mm powder vitreous enamel coating
• Approximately 1.4mm total finished thickness
• Internal and external enamel protection
• Smooth matt-black finish
• Friction-fit connection system
• Suitable for compatible gas, oil and solid-fuel appliances
• Temperature classification: T600
• Product designation: EN 1856-2 T600 N1 Vm L80120 G375
• Declared minimum distance from combustible materials: 375mm
• 12-year warranty, subject to the manufacturer’s terms

Technical Specification

• Product type: One-piece stove-pipe offset
• Nominal diameter: 125mm (5 inches)
• Built-in lateral offset: Approximately 100mm
• Lower connection: Short male-ended pipe section
• Material: Zero-carbon steel
• Steel thickness: 1.2mm
• Enamel thickness: Approximately 0.2mm
• Total finished thickness: Approximately 1.4mm
• Coating: Powder vitreous enamel
• Coating position: Internal and external
• Colour: Matt black
• Joint type: Friction fit
• Fuel suitability: Gas, oil and solid fuel
• Temperature classification: T600
• Product standard: EN 1856-2
• Full designation: EN 1856-2 T600 N1 Vm L80120 G375
• Distance from combustibles: 375mm
• Warranty: 12 years, subject to terms
• Model/SKU: 67-125-045

What Is a One Piece Stove Offset?

A stove offset changes the horizontal position of a connecting flue while allowing the pipe to continue generally upwards. It is often required when the stove outlet and the intended chimney connection do not sit on the same vertical centre line.

This model incorporates an approximately 100mm offset into one purpose-made component. Consequently, it can remove the need to assemble a similar change in alignment from two separate elbows and an intermediate pipe section.

The one-piece design can produce a more streamlined appearance, especially where the connecting pipe remains visible above the appliance. It may also simplify installation by reducing the number of components that must be measured, aligned and joined.

However, the offset is fixed rather than adjustable. Measure the required sideways movement carefully and check the product dimensions before ordering.

When Is a 100mm Flue Offset Useful?

This fitting may be suitable when a stove outlet sits slightly to one side of an existing chimney opening, register-plate connection, flexible-liner adaptor or insulated twin-wall chimney route.

For example, an appliance may need to be positioned centrally on a hearth even though the chimney connection sits approximately 100mm to one side. The offset can help bridge that difference without using several separate bends.

It may also help where an obstruction prevents the connecting pipe from continuing directly upwards. Nevertheless, the component must never be used to avoid required safety clearances or to create an unsuitable flue route.

The installer must confirm that the fixed offset, total height and connection positions suit the appliance and the complete chimney design.

Why Choose a One Piece Offset Instead of Separate Bends?

A traditional offset can be created with two bends and a short connecting pipe. While that arrangement may offer greater adjustment, it also introduces additional fittings and joints.

The VIT-Smooth One Piece Offset provides the change in alignment within one manufactured component. This gives several potential benefits:

• Fewer visible joints above the appliance
• A cleaner and more balanced appearance
• Fewer separate fittings to order
• Less time spent aligning individual bends
• Reduced risk of choosing incompatible intermediate components
• A fixed and consistent offset

However, separate bends may remain more suitable where the required offset differs from approximately 100mm or where the installer needs to adjust the angle. Always choose the arrangement that provides the safest and most appropriate flue route.

Planning the Flue Route

Measure both the horizontal offset and the available installation height before ordering. The required measurement should be taken between the centre line of the appliance outlet and the centre line of the intended vertical flue route.

Check the complete fitting dimensions rather than relying only on the stated 100mm offset. The overall height, connection depth and position of the formed bends can affect where the upper pipe enters the chimney system.

Allow enough room to assemble the joints correctly. Do not force the pipe sideways or use the fitting to pull two misaligned components together.

The completed flue should rise correctly towards the chimney and remain properly supported. The appliance outlet must not carry the weight of a flexible liner, twin-wall chimney or unsupported vertical pipe run.

Why Choose VIT-Smooth?

VIT-Smooth combines robust steel construction with a carefully finished vitreous enamel surface. Welded areas are ground smooth before enamelling, helping to produce discreet joints and a clean appearance around visible stove installations.

The deep matt-black colour complements many traditional, contemporary and freestanding stoves. It also coordinates with other compatible VIT-Smooth pipes, bends, tees, adaptors and access components.

The fitting uses 1.2mm zero-carbon steel with an approximately 0.2mm powder vitreous enamel coating. This gives an approximate total finished thickness of 1.4mm.

Vitreous enamel covers both the internal and external surfaces. As a result, it helps protect the underlying steel from heat, combustion gases and potentially corrosive deposits when the product is installed, used and maintained correctly.

Suitable Applications

• Compatible wood-burning stoves
• Compatible multifuel stoves
• Suitable gas heating appliances
• Suitable oil-fired appliances
• 125mm VIT-Smooth connecting-flue systems
• Visible single-wall stove-pipe installations
• Appliance outlets positioned away from the chimney centre line
• Connections leading towards a suitable flexible flue liner
• Connections leading towards a suitable chimney stack
• Connections leading towards an insulated twin-wall chimney system
• Installations requiring an approximately 100mm fixed offset

Installation Direction

Install the short male or smaller-diameter end of the offset pointing downwards towards the appliance. The upper end should connect to the next compatible component leading towards the chimney.

This male-end-down arrangement helps keep condensate and combustion deposits inside the flue route instead of allowing them to escape through the outside of a joint.

Do not invert the component simply to obtain a different connection arrangement. If the appliance outlet does not accept the lower connection, a suitable stove adaptor or alternative VIT-Smooth component may be required.

Always follow the latest appliance and flue-system installation instructions.

Checking Appliance Compatibility

A nominal 125mm appliance outlet does not guarantee that every 125mm stove-pipe component will connect directly. Appliance spigots and flue fittings can use different external diameters, internal diameters and joint profiles.

Before ordering, confirm:

• The flue diameter specified by the appliance manufacturer
• The exact size and type of appliance outlet
• Whether a stove adaptor is required
• The required horizontal offset
• The available height above the appliance
• The connection required at the chimney or liner
• The required distance from combustible materials

Never reduce the flue diameter unless the appliance manufacturer and applicable regulations specifically permit it.

Jointing and Sealing

Compatible VIT-Smooth components use close-fitting friction-fit connections. Therefore, fire clay is not required to assemble the system.

However, the appliance and flue-system manufacturers determine the approved jointing method. Only use suitable fire cement, high-temperature sealant or another jointing compound where the current instructions require or permit it.

Push every connection together fully and keep the adjoining components correctly aligned. Do not use excessive force, as this may damage the enamel coating or distort the joint.

Where a mechanical fixing is required, use the approved method and take care not to damage the fitting or leave exposed steel untreated.

Can the Offset Pipe Be Cut?

A vitreous enamel component should remain at its manufactured size whenever possible. Cutting can chip the enamel and expose the underlying steel, which may then become vulnerable to corrosion.

Cutting the offset may also alter the connection arrangement or remove the correctly formed end. Therefore, do not modify the fitting without confirming that the proposed alteration is permitted and will still provide a safe joint.

If cutting is permitted and proves unavoidable, protect every exposed steel edge with suitable high-temperature stove paint. Remove sharp edges and ensure the altered component still connects securely.

If a height adjustment is required, a compatible fixed-length or adjustable VIT-Smooth pipe may provide a more suitable solution.

Installation and Safety Information

Use the VIT-Smooth offset only as a single-wall connecting flue between a compatible appliance and a suitable chimney, flexible flue liner or insulated twin-wall chimney system.

Never use this single-wall offset pipe to pass through a wall, ceiling, floor, roof, cupboard or concealed void. A suitably tested and insulated chimney system must be used wherever the flue passes through part of the building structure.

Maintain at least the declared 375mm distance from combustible materials. Combustible materials can include timber, furniture, decorative finishes and some plasterboard wall or ceiling constructions.

Do not assume that plasterboard is safe simply because its visible surface does not readily burn. It may be fixed to timber battens or form part of a combustible structure.

If the appliance instructions specify a greater clearance than 375mm, follow the greater distance. The complete installation must satisfy the most demanding clearance requirement that applies to any component.

Do not place excessive sideways pressure on the appliance outlet. The offset and adjoining pipework must remain correctly aligned and supported.

A competent installer should design and fit the complete flue system. For solid-fuel installations, use a suitably qualified installer, such as a HETAS-registered installer, or arrange Building Control notification where required.

Finally, follow the appliance instructions, current VIT-Smooth guidance, applicable standards and current Building Regulations.

Access for Inspection and Sweeping

The one-piece offset does not include an access door. Therefore, the complete installation must provide another suitable means of inspecting and sweeping the connecting pipe and chimney.

Changes in flue direction can make cleaning more difficult. The installer and chimney sweep should confirm that suitable equipment can reach every relevant part of the system.

Depending on the arrangement, an access-door pipe, access bend, tee with removable cap or another approved cleaning point may be required.

Do not permanently box in the offset or adjoining joints. Visible and accessible components are easier to inspect for movement, corrosion, damage or leakage.

Inspection and Maintenance

A competent person should inspect and clean the complete chimney regularly. The correct frequency depends on the appliance, fuel type, frequency of use and condition of the chimney.

During maintenance, inspect the offset and adjoining joints for movement, distortion, corrosion and enamel damage. Check that every component remains properly supported and that the required clearance from combustible materials has not been reduced.

Use suitable cleaning equipment that will not damage the vitreous enamel surface. Avoid abrasive cleaners or tools that may scratch or chip the finish.

Replace any component that becomes badly damaged, corroded, distorted or insecure. Do not continue using the appliance if there are signs that smoke or combustion gases may be escaping from a joint.

Product Guide

• Download the VIT-Smooth brochure

Why Buy from SNH Tradecentre?

• Competitive prices: We aim to provide excellent value across our stove, flue and chimney range.
• Helpful product advice: Our experienced team can help you compare offsets, bends, adaptors and connecting pipes.
• Genuine products: Order from an established plumbing and heating merchant.
• Matching components: Choose from an extensive range of compatible 125mm VIT-Smooth products.
• Collection available: Collect eligible in-stock products from our Birchington trade counter.
• UK delivery: Choose from the available delivery services at checkout.
• Trade and public welcome: We supply installers, homeowners, landlords and property professionals.
• Support after purchase: Contact our team if you need assistance with a product supplied by SNH Tradecentre.

Need help confirming whether this offset suits your stove and proposed flue route? Call SNH Tradecentre on 01843 842727 before ordering. If possible, have the appliance make, model, outlet measurement and required offset available.

Read reviews from SNH Tradecentre customers on Google

Frequently Asked Questions

What size is this offset pipe?

It has a nominal diameter of 125mm, equivalent to approximately five inches. It is designed for use with compatible 125mm VIT-Smooth components.

How much sideways offset does it provide?

The fitting provides an approximately 100mm built-in lateral offset. Check the dimensional information and measure the required centre-line movement before ordering.

What is a one-piece stove offset used for?

It moves the connecting flue sideways where the stove outlet does not align directly beneath the intended chimney or flue connection.

Why use this fitting instead of two separate bends?

Its one-piece construction creates the offset with fewer separate fittings and visible joints. This can produce a cleaner appearance and simplify the connecting flue arrangement.

Is the offset adjustable?

No. The offset is formed into the component and is fixed at approximately 100mm. Separate bends may be more suitable if the installation requires a different or adjustable offset.

Which way up should it be installed?

The short male or smaller-diameter end should point downwards towards the appliance. The upper connection continues towards the chimney system.

Will it connect directly to every 125mm stove outlet?

No. Appliance spigots can have different diameters and connection profiles. A suitable stove adaptor may be required even where the stated nominal diameter is 125mm.

Can it be used with a wood-burning stove?

Yes, it is suitable for compatible wood-burning and multifuel stoves. Confirm the required flue diameter and product classification in the appliance manufacturer’s instructions.

Can it be used with gas or oil appliances?

Yes, the product is suitable for compatible gas, oil and solid-fuel appliances. The appliance instructions must permit the proposed flue diameter and arrangement.

Can the offset pass through a wall or ceiling?

No. It is a single-wall connecting-flue component and must not pass through walls, ceilings, floors, roofs or concealed spaces. Use a suitable insulated chimney system for building penetrations.

How far must it be from combustible materials?

The product designation declares a minimum distance of 375mm from combustible materials. Follow any greater clearance specified by the appliance manufacturer or another part of the system.

Does it require fire clay?

No. Compatible VIT-Smooth components use friction-fit connections. Only apply an approved jointing compound where the current appliance or flue-system instructions require or permit it.

Can the offset pipe be cut?

It should remain at its manufactured size wherever possible. Cutting may chip the enamel, expose the steel or remove a required connection. If an approved alteration exposes steel, protect it with suitable high-temperature paint.

Does the fitting include a sweeping door?

No. This model does not include an access door. The complete flue installation must provide suitable access for inspection and chimney sweeping.

What is its maximum operating temperature?

The fitting carries a T600 classification. Therefore, its maximum continuous operating-temperature classification is 600°C. Always observe any lower limit specified by the appliance manufacturer.

What does G375 mean?

Within the product designation, G indicates that the component has passed the applicable soot-fire resistance requirements. The figure 375 declares the tested distance from combustible materials in millimetres.

Is the offset supplied with a warranty?

Yes. It is supplied with a 12-year warranty, subject to the manufacturer’s terms, correct installation, suitable use and appropriate maintenance.

Who should install the offset pipe?

A competent installer should fit it as part of a correctly designed chimney system. For solid-fuel installations, consider using a HETAS-registered installer or arranging Building Control notification where required.

Manufacturers may update product dimensions, connection profiles and installation guidance. Therefore, check the latest VIT-Smooth literature and confirm appliance compatibility before ordering.