Starfit A403 316 SCH10S Concentric Reducer Welded 6x4, Stainless Steel Pipe Reducer, Butt Weld Reducer Fitting, Reducer Coupling

Out of stock
£46.62
Starfit A403 316 SCH10S Concentric Reducer Welded 6x4, Stainless Steel Pipe Reducer, Butt Weld Reducer Fitting, Reducer Coupling

Starfit A403 316 SCH10S Concentric Reducer Welded 6x4, Stainless Steel Pipe Reducer, Butt Weld Reducer Fitting, Reducer Coupling

SKU W-R05568
Manufacturer part number
R05568*
£46.62
inc VAT£38.85 ex VAT
Out of stock

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Description

Product Overview

The Starfit A403 316 SCH10S concentric reducer welded 6x4 is a stainless steel butt weld pipe fitting designed to reduce a larger pipe run down to a smaller size while maintaining a central, straight-line flow path. Suitable for commercial plumbing and industrial pipework, it delivers a strong, leak-resistant welded joint and long-lasting corrosion resistance.

Key Features

  • 316 stainless steel construction – helps resist corrosion for dependable performance in demanding systems.
  • Concentric reducer design – maintains aligned pipework and smoother flow when transitioning between sizes.
  • Butt weld ends – enables a robust welded connection to reduce the risk of leaks over time.
  • SCH10S wall thickness specification – suitable for compatible stainless pipework systems where SCH10S fittings are required.
  • 6x4 size reduction – ideal for stepping down pipe diameter cleanly without unnecessary extra couplings.

Use Case / Application

Designed for use in commercial plumbing and stainless steel pipe installations where a diameter reduction is required. Common applications include:

  • Plant rooms and service corridors in commercial buildings
  • Heating and plumbing distribution pipework
  • Industrial and process pipe runs requiring corrosion-resistant stainless fittings
  • Maintenance and replacement work where an existing line transitions from 6 to 4

Problem → Solution

Ideal for reducing pipe size from 6 to 4 in welded stainless systems, providing a strong, tidy transition that helps maintain reliable flow and minimises leak risk.

Product Specifications

• Manufacturer – Starfit
• Manufacturer Part Number (MPN) – R05568*
• Dimensions / Size – 6x4
• Material / Construction – 316 Stainless Steel
• Product Type – Welded Concentric Reducer (Butt Weld Pipe Fitting)
• Typical Applications / Use Cases – Commercial plumbing, heating and industrial stainless pipework, pipe diameter transitions
• Technical Specifications – A403, SCH10S

Why Buy from BHL

Starfit manufacture dependable components for professional plumbing and pipework, built to meet demanding site requirements. Choose this A403 316 SCH10S welded concentric reducer 6x4 for a strong, corrosion-resistant transition in stainless systems. Buy online from BHL for competitive pricing, free* and fast UK delivery, and products delivered with care from UK warehouses. BHL are a specialist online merchant, trusted by thousands of satisfied customers online since 1998 with thousands of 5 star reviews.
*see our terms

Reviews

Buying guide: Commercial Plumbing

Commercial plumbing covers pipe systems, fittings and valves for larger buildings, plant rooms and industrial services. The range includes stainless steel press and weld fittings, PVC-U, ABS and PP-R plastic systems, polyethylene for buried supplies, flanges, unions, pressure reducing valves and drain taps.

Systems and how they join

  • Stainless steel press: fittings crimped onto the pipe with a pressing tool. Gas fittings are a separate range from water fittings, so use the version made for the service.
  • PVC-U and ABS: solvent welded. Each plastic needs its own cement, as the cements are not interchangeable.
  • PP-R: polypropylene pipe for hot and cold water, covered by BS EN ISO 15874. It is joined by heat fusion: socket fusion on a heated welding tool, electrofusion fittings, or butt welding on larger sizes.
  • Polyethylene: PE pipe for water supply to BS EN 12201, joined with electrofusion couplers and tapping saddles after the pipe surface has been scraped clean.

Sizes, ratings and flanges

Plastic systems are sized by the pipe's outside diameter in millimetres, while many metal fittings and valves use inch thread sizes or DN nominal sizes, so check how each part is sized before mixing systems. A PN figure is the nominal pressure in bar at 20°C, and the safe working pressure falls as temperature rises. Steel flanges are made to BS EN 1092-1, with dimensions set by both the DN size and the PN rating, so match both when joining a flanged valve to pipework.

Regulations

Pipes and fittings on drinking water must be suitable under the Water Supply (Water Fittings) Regulations 1999. Work on gas pipework must only be carried out by a Gas Safe registered engineer.

For standard domestic sizes, see pipe systems and fittings or browse valves.

Shop all Commercial Plumbing

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