SPL Series · Specialty CuNi Fittings
Copper-Nickel Vent Plug
Our CuNi vent plug is a plug drilled and tapped to provide a venting point on a piping system. Manufactured in both 90/10 (UNS C70600) and 70/30 (UNS C71500) grades to Manufacturer specification / customer drawing, it is forged and machined in-house with full material traceability.
Size Range1/8" – 4" NPS (custom sizes on request)
Pressure Classes3000 / 6000 (typical)
StandardManufacturer specification / customer drawing
Grades AvailableCuNi 90/10 & 70/30
DIMENSIONS & RATINGS
Available Sizes, Pressure Ratings & Dimensions
Nominal reference values for the specialty cuni fittings range. Exact dimensions for the vent plug are confirmed on the certified drawing issued with your order.
| NPS | Connection Type | Typical Wall (mm) | Notes |
|---|---|---|---|
| 1/8" – 1/2" | Threaded / Socket | 2.3 – 2.9 | Instrument & vent/drain sizing |
| 3/4" – 2" | Threaded / Socket / Compression | 3.0 – 3.9 | Utility & hose connections |
| 2-1/2" – 4" | Socket / Threaded / Custom | 4.5 – 5.1 | Larger transition & custom parts |
MATERIAL GRADES
Compare grades in detail →
CuNi 90/10 vs. 70/30
| Grade | UNS | Composition |
|---|---|---|
| 90/10 | C70600 | 88-90% Cu, 10-11% Ni, 1.0-1.8% Fe |
| 70/30 | C71500 | 65-69% Cu, 29-33% Ni, 0.4-1.0% Fe |
STANDARDS COMPLIANCE
Manufactured & Tested To
- ✓Manufacturer specification / customer drawing
- ✓ASTM B466 / B467 material specification
- ✓EN 10204 3.1 material test certificates
- ✓ISO 9001:2015 quality management system
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