Embrass Peerless Atomic End Feed Larger Bore Fittings — 28mm, 35mm, 42mm and 54mm for UK Plumbers

When it comes to soldering copper pipework in larger bore installations — commercial heating systems, pressurised mains, primary circuits and industrial plant rooms — the fitting specification matters. Embrass Peerless Atomic end feed fittings are manufactured to BS EN 1254-1 and carry WRAS approval, making them suitable for potable water systems at all the sizes UK plumbers regularly encounter above 22mm: 28mm, 35mm, 42mm and 54mm.

At APM Electricals, we stock the full Atomic end feed range from 10mm through 54mm. This article focuses on the larger bore sizes — the couplers and reducers trade plumbers reach for on main distribution runs, plant room headers, and high-flow hot water systems.

Why Choose End Feed Over Yorkshire (Integral Solder) Fittings?

End feed fittings require the plumber to feed solder wire into the joint after heating — they contain no pre-loaded solder ring. This gives several advantages on larger bore work:

• Lower cost per fitting — no solder pre-loaded, so the fitting itself is cheaper
• Greater control — the plumber can inspect the joint and feed additional solder to ensure full penetration on larger diameters where heat transfer is slower
• Consistent quality — eliminates the risk of an integral solder ring melting prematurely or being insufficient on a 42mm or 54mm joint
• Trade preference — most experienced heating engineers prefer end feed on anything 28mm and above

Embrass Peerless Atomic fittings are manufactured from DHP (phosphorus deoxidised high residual) copper, which offers superior solderability and corrosion resistance compared to lower-grade copper alloys. The Atomic name refers to the tight dimensional tolerances maintained across the range — critical for leak-free joints in pressurised systems.

28mm Atomic End Feed Fittings

28mm is the most common larger bore size on domestic heating primaries and commercial secondary circuits. A 28mm main distribution run feeding multiple radiator branches is a staple job for any heating engineer.

The Embrass Peerless 28mm Atomic End Feed Coupler is the core fitting for extending or joining 28mm copper tube. At under £1 per piece, it's competitively priced against both Screwfix and Toolstation for trade quantities. We also stock 28mm to 15mm and 28mm to 22mm reducing couplers, as well as fitting reducers in the same sizes — useful when stepping down from a 28mm primary to smaller branch connections.

35mm Atomic End Feed Fittings

35mm copper is less common in domestic work but appears frequently in commercial heating headers, calorifiers, and larger pressurised mains supplies. The Embrass Peerless 35mm Atomic range includes straight couplers and reducers stepping down to 22mm and 28mm — the key transitions needed when running a 35mm primary that branches into 28mm or 22mm distribution pipework.

Reducing couplers (35mm × 22mm and 35mm × 28mm) and fitting reducers in the same combinations give engineers flexibility in how they step down the distribution run without needing to stock multiple fitting types.

42mm Atomic End Feed Fittings

42mm is the standard specification for commercial boiler primaries, large cylinder primaries, and district heating secondary connections. At this diameter, soldering technique becomes particularly important — the fitting needs adequate pre-heat time and a controlled solder feed to achieve a full, void-free joint around the circumference.

The Embrass Peerless 42mm Atomic End Feed Coupler is WRAS-approved and manufactured to the same close-tolerance specification as the smaller sizes. We stock 42mm reducers down to 15mm, 22mm, 28mm and 35mm — all the transitions a plant room installation is likely to require.

54mm Atomic End Feed Fittings

54mm copper is the largest standard bore in the Atomic range and is used on district heating mains, commercial plant room headers, pressurised primary circuits for large commercial boilers, and industrial process pipework. At this diameter, WRAS approval is particularly important — any fitting on a potable water main must carry documentation.

The Embrass Peerless 54mm Atomic End Feed Coupler and corresponding reducers (54mm × 22mm, 54mm × 28mm, 54mm × 42mm) are stocked by APM Electricals for next-day availability. The 54mm × 42mm reducer is a common fitting on plant room headers where multiple 42mm branch circuits are taken off a 54mm main.

Soldering Technique on Larger Bore Fittings

For trade plumbers less familiar with larger bore soldering, a few practical reminders:

• Use a twin-flame torch on 42mm and 54mm — a single flame struggles to bring the full circumference to soldering temperature evenly
• Pre-heat the fitting body, not the tube — heat conducts from the fitting to the pipe, which minimises the risk of annealing the tube
• Use lead-free solder on all potable water connections — Sievert or Fernox LS-X is widely used in the trade
• Clean aggressively — use flux paste and clean both tube and socket with abrasive cloth before assembly on larger bore; oxide build-up is more significant on 42mm and 54mm tube
• Support the joint — don't allow a freshly-soldered 54mm fitting to be under load until fully cooled; the joint is soft until the solder solidifies

Pricing and Availability

All Embrass Peerless Atomic end feed larger bore fittings at APM Electricals are priced to compete with Screwfix and Toolstation on trade quantities. 28mm couplers are under £1; 54mm couplers are under £6. Reducers are similarly priced and available for next-day delivery across the UK.

We stock the complete Atomic range from 10mm through 54mm, including all the key reducing combinations listed above. If you need a specific size combination not shown on the website, contact the team at info@apmi.uk and we'll source it for you.

Product Cards

Embrass Peerless Atomic End Feed Coupler 28mm

WRAS-approved 28mm end feed straight coupler for copper tube. Manufactured to BS EN 1254-1 from DHP copper. Essential fitting for 28mm heating primaries and distribution pipework. Competitively priced for trade quantities.

Price: £0.85 inc VAT

Buy Now — 28mm Atomic EF Coupler

Embrass Peerless Atomic 35mm End Feed Coupler

35mm straight end feed coupler for commercial heating headers and calorifier connections. WRAS-approved, BS EN 1254-1 compliant. Pair with 35mm × 22mm or 35mm × 28mm reducers for distribution run step-downs.

Price: £1.75 inc VAT

Buy Now — 35mm Atomic EF Coupler

Embrass Peerless Atomic 42mm End Feed Coupler

42mm end feed coupler for commercial boiler primaries, large cylinder connections and plant room distribution headers. WRAS-approved for potable water applications. Available with matching 42mm reducers for all common step-down sizes.

Price: £4.20 inc VAT

Buy Now — 42mm Atomic EF Coupler

Embrass Peerless Atomic 54mm End Feed Coupler

54mm end feed coupler for large commercial and industrial pipework — district heating mains, plant room headers and high-flow commercial systems. WRAS-approved, BS EN 1254-1. Reducing fittings available for 54mm × 22mm, 28mm and 42mm transitions.

Price: £5.20 inc VAT

Buy Now — 54mm Atomic EF Coupler

Summary

Embrass Peerless Atomic end feed fittings in 28mm, 35mm, 42mm and 54mm give trade plumbers and heating engineers a WRAS-approved, BS EN 1254-1 compliant solution for larger bore copper soldering work. APM Electricals stocks the full range with competitive trade pricing and next-day UK delivery.

Browse the full copper fittings collection at APM Electricals, or call us on 020 8702 8080 for trade account enquiries. Visit us at 24 Western Avenue, Acton, London W3 7TZ.