Description
Cast Iron Reducing Tee
ASC / SCI Fig. 3358R Cast Iron Reducing Tee provides a threaded branch connection where different pipe sizes are required in a Class 125 piping system.
Manufactured from cast iron conforming to ASTM A126, the Fig. 3358R features female NPT connections and is available with a black or hot-dip galvanized finish for industrial, commercial, water, and mechanical piping applications.
Product Highlights
- ASC / SCI Fig. 3358R
- Class 125 reducing tee
- ASTM A126 cast iron
- Female NPT connections
- Black or galvanized finish
- UL/ULC Listed and FM Approved
Technical Specifications
| Product Type | Cast Iron Reducing Tee |
|---|---|
| Brand | ASC / SCI |
| Figure | 3358R |
| Configuration | Reducing Tee |
| Material | Cast Iron |
| Material Standard | ASTM A126 |
| Fitting Standard | ASME B16.4 Class 125 |
| Threads | NPT per ASME B1.20.1 |
| Finish | Black or Hot-Dip Galvanized per ASTM A153 Class A |
| Agency Approvals | UL/ULC Listed and FM Approved |
Construction Details
The SCI Fig. 3358R Reducing Tee is manufactured from cast iron conforming to ASTM A126 for use in compatible Class 125 threaded piping systems.
Fitting dimensions conform to ASME B16.4 Class 125, while the female connections use NPT threads in accordance with ASME B1.20.1.
The reducing configuration allows a smaller connection to branch from or transition within a threaded piping arrangement while maintaining a compact tee-style fitting.
Reducing Tee Design & Applications
Reducing Tee Design
- Three female threaded ends
- Reducing connection configuration
- 90° branch connection
- Class 125 construction
- Cast iron body
Typical Applications
- Industrial piping systems
- Commercial piping systems
- Water piping applications
- Mechanical piping systems
- Threaded branch transitions
Installation & Selection Considerations
- Confirm Fig. 3358R is required.
- Verify all connection sizes.
- Confirm Class 125 compatibility.
- Use suitable thread sealant.
- Avoid excessive tightening.

Use the ASC / SCI Fig. 3358R product submittal to confirm cast iron construction, Class 125 requirements, NPT threads, finish options, approvals, and reducing tee specifications.
Need Help Selecting a Cast Iron Reducing Tee?
Need help confirming connection sizes, Class 125 requirements, finish, or compatibility with your threaded piping system? The GetPipe.com Team can help.
Frequently Asked Questions
What is the SCI Fig. 3358R?
The Fig. 3358R is a cast iron threaded reducing tee designed to connect different pipe sizes within a three-way piping arrangement.
What material is the reducing tee?
The Fig. 3358R is manufactured from cast iron conforming to ASTM A126.
What fitting class is the Fig. 3358R?
The reducing tee conforms to ASME B16.4 Class 125 dimensional requirements.
What type of threads does the tee use?
The fitting uses female NPT threaded connections conforming to ASME B1.20.1.
What is a reducing tee used for?
It provides a three-way threaded connection where different pipe sizes are required within the piping arrangement.
What finishes are available?
ASC specifies black or hot-dip galvanized finishes, with the galvanized finish conforming to ASTM A153 Class A.
Is the Fig. 3358R UL/ULC Listed and FM Approved?
Yes. ASC identifies its cast iron threaded fittings as UL/ULC Listed and FM Approved, subject to applicable listing and approval limitations.
What should I confirm before ordering?
Confirm the required connection configuration, NPT connections, Class 125 requirements, and the required finish.
Important Ordering & Installation Notes
- Confirm Fig. 3358R configuration.
- Verify all connection sizes.
- Select the required finish.
- Apply suitable thread sealant.
- Avoid excessive installation torque.