STZ Industries 4 in FIP to 3 in FIP Galvanized Malleable Iron Reducing Coupling provides a solid, leak‑resistant solution for changing pipe sizes in threaded systems. Built from durable malleable iron and finished with galvanizing, this reducing coupling is designed to withstand the demands of everyday plumbing while resisting corrosion in damp or outdoor environments. Designed specifically for transitioning from a 4-inch pipe to a 3-inch pipe with female iron pipe threads on both ends, this fitting delivers a secure, easy-to-install connection in residential, commercial, and irrigation applications. The galvanized finish adds an extra layer of protection against rust, helping extend the life of your piping system even in exposed or humid settings. Key specifications
-
Connections: 4 in. FIP to 3 in. FIP (Female Iron Pipe threads on both ends)
-
Material & Finish: Malleable iron with galvanized coating for enhanced durability and corrosion resistance
-
Pressure Rating: Up to 300 psi
-
Temperature Rating: Up to 150°F (65°C) continuous service
-
Lead Content: Lead-free construction for safer use in various plumbing scenarios
-
Packaging: Bagged for convenient handling and storage
-
Type: Reducing coupling to transition from 4" to 3" systems
Practical use cases and benefits
- Ideal for retrofits and repairs where older 4" piping must connect to a 3" line without replacing entire runs.
- Suitable for potable water, heating loops, and outdoor irrigation where a strong, corrosion‑resistant connection is needed.
- A cost‑effective alternative to brass or stainless fittings when performance requirements are driven by standard residential or light commercial pressure. Installation tips
- Clean and inspect the male threads on the pipes before assembly. - Apply an appropriate pipe thread sealant or PTFE tape rated for potable water to the male threads, then thread the coupling firmly with a wrench—avoid over-tightening to prevent damage.
- Align the pipes properly before tightening to ensure a straight, leak‑free joint.
- After installation, test the connection under normal working pressures to confirm a secure seal. This STZ Industries reducing coupling combines dependable performance with practical, real‑world value. Its lead‑free construction, galvanized finish, and robust malleable iron build make it a reliable choice for changing pipe sizes in a wide range of plumbing projects while helping to ensure long-term peace of mind.
