Copper End Feed Reducing Tee Fittings — Reliable Branch Connections for Plumbing & HVAC Systems
When you're running a branch line off an existing copper main — whether for a bathroom feed, a radiator circuit, or an HVAC refrigerant line — a loose or mismatched fitting can mean leaks, callbacks, and costly rework. Plumbers, HVAC technicians, and serious DIYers who work with copper pipe systems need reducing tees that seat cleanly, solder reliably, and hold pressure over the long term.
Each fitting is a copper end feed reducing T-shaped tee, sized by outer diameter in the format φ1 x φ2 x φ3 — where φ1 and φ3 are the equal run ends and φ2 is the reduced branch outlet. Available in 112 size combinations ranging from 8mm (≈5/16") to 108mm (≈4-1/4") outer diameter, with wall thicknesses from 0.8mm to 2.5mm scaled to the pipe size. Sold individually (1 Pcs per order) so you can order exactly what your job requires.
Typical applications include domestic hot and cold water distribution, underfloor heating manifold branches, copper refrigerant line sets in HVAC installations, and industrial process piping where a soldered reducing branch connection is specified. The end feed capillary socket design works with standard soft solder or silver brazing alloy, making these fittings compatible with both residential plumbing and commercial mechanical systems.
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Compatibility: Designed for standard copper tube per EN 1057 (metric) and ASTM B88 (imperial) dimensions. Confirm your pipe's outer diameter before ordering — copper pipe OD differs from nominal pipe size (NPS). Mixed metric/imperial sizes (e.g., 6.35mm, 9.52mm, 12.7mm, 25.4mm, 28.6mm) are included to cover both systems.
✅ Key Features of These Copper End Feed Reducing Tee Fittings
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🔩End Feed Capillary Socket Design — The smooth internal bore accepts standard copper tube for a flush, gap-free fit before soldering, producing a clean capillary joint with consistent solder draw.
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📐112 Size Combinations in One Listing — Outer diameters from 8mm to 108mm with branch reductions across the full range, covering metric and imperial copper tube sizes used in US, UK, and EU plumbing systems.
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🏗️Wall Thickness Matched to OD — Thinner walls (0.8mm) on small-bore fittings keep weight low; heavier walls (up to 2.5mm) on large-bore sizes provide the structural integrity needed for high-pressure or commercial copper pipe branch connections.
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🌡️Suitable for Hot & Cold Water, Gas, and HVAC — Copper's thermal conductivity and corrosion resistance make these fittings appropriate for potable water lines, hydronic heating circuits, and refrigerant copper line set branch points when properly brazed.
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⚙️Compatible with Soft Solder and Silver Brazing — Works with lead-free solder for potable water applications and silver brazing alloy for gas or high-pressure systems, giving installers flexibility across job types.
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📦Single-Piece Ordering for Exact Quantities — Sold as 1 Pcs per variant so you can order precisely the count your project needs without overstocking odd sizes from bulk packs.
📐 Technical Specifications — Copper End Feed Reducing Tee
| Product Type |
End Feed Reducing T-Shaped Tee (Capillary Solder Fitting) |
| Material |
Copper |
| Connection Method |
End feed capillary socket (soft solder or silver braze) |
| Size Format |
φ1 (run) × φ2 (branch) × φ3 (run) — all outer diameter measurements |
| Outer Diameter Range (Run) |
8mm (≈5/16") to 108mm (≈4-1/4") |
| Branch Diameter Range |
6.35mm (1/4") to 89mm (≈3-1/2") |
| Wall Thickness |
0.8mm (8mm–12.7mm OD) / 1.0mm (15mm–22mm OD) / 1.2mm (25.4mm–35mm OD) / 1.5mm (42mm–54mm OD) / 1.8mm (67mm OD) / 2.0mm (76mm–89mm OD) / 2.5mm (108mm OD) |
| Number of Size Variants |
112 combinations |
| Quantity per Order |
1 Pcs |
| Finish |
Bright copper (natural) |
| Typical Applications |
Domestic plumbing, HVAC refrigerant lines, hydronic heating, gas distribution (when brazed per local code) |
| Compatible Tube Standards |
EN 1057 (metric), ASTM B88 (imperial) |
| Country of Origin |
See variant options |
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Note: Copper pipe outer diameter (OD) is not the same as nominal pipe size (NPS) or DN designation. Always measure your existing pipe's OD directly before selecting a size. If you are unsure, contact us to confirm compatibility.
❓ Frequently Asked Questions
How do I choose the right size reducing tee for my pipe?
The size format is φ1 x φ2 x φ3, where φ1 and φ3 are the two equal run ends (outer diameter) and φ2 is the reduced branch outlet. Measure the outer diameter of your existing copper pipe and match it to φ1/φ3. Then select the branch size (φ2) that fits your branch line.
Common inch-to-mm conversions: 6.35mm = 1/4" | 9.52mm ≈ 3/8" | 12.7mm = 1/2" | 15mm ≈ 1/2" (metric) | 19mm ≈ 3/4" | 25.4mm = 1" | 28.6mm ≈ 1-1/8" | 35mm ≈ 1-3/8" | 54mm ≈ 2-1/8".
What pressure rating do these copper tee fittings typically handle?
Copper end feed fittings generally support working pressures up to 200 PSI for cold water and typically 150 PSI for hot water systems, depending on pipe diameter and wall thickness. Larger OD sizes with thicker walls (2.0mm–2.5mm) are suited for heavier-duty applications. Always verify against your local plumbing code and system design pressure.
Are these fittings suitable for outdoor or corrosive environments?
Copper is naturally corrosion-resistant and generally performs well in outdoor and humid environments. It is not recommended for direct burial in highly acidic soils without protective sleeving. For outdoor exposed installations, copper typically develops a protective patina over time that helps resist further corrosion.
What connection standard do these fittings use — are they threaded?
No threads. These are end feed (capillary solder) fittings — the copper pipe slides into the fitting socket and is joined by applying solder or brazing alloy. They are compatible with standard copper tube conforming to EN 1057 (metric) and ASTM B88 (imperial) dimensions, depending on the size selected.
Can I use these copper reducing tees for gas lines?
Copper end feed fittings are generally approved for natural gas and LPG lines in many jurisdictions when properly brazed (hard soldered). Soft solder is typically not approved for gas applications. Always check your local gas codes and regulations before installation, and use a licensed professional where required.
What solder or flux should I use with these fittings?
For potable water systems, use lead-free solder (e.g., 95/5 tin-antimony or silver-bearing alloys) with a water-soluble flux. For gas or high-pressure applications, silver brazing alloy with appropriate flux is generally recommended. Always clean the pipe and fitting socket with emery cloth and apply flux before soldering for a reliable joint.
How do I know which wall thickness is right for my application?
Wall thickness in this product range scales automatically with outer diameter — it is pre-matched in each variant. Smaller ODs (8mm–12.7mm) use 0.8mm walls; mid-range (15mm–35mm) use 1.0mm–1.2mm; larger sizes (42mm–54mm) use 1.5mm; and the largest (67mm–108mm) use 1.8mm–2.5mm. Simply select the OD combination you need and the appropriate wall thickness is included.
🛒 Select your size (φ1 x φ2 x φ3) above, then add to cart — ships from our US warehouse.
