The STZ Industries 1-1/2 in. FIP x 3/4 in. FIP Black Malleable Iron Reducing Coupling is a rugged, reliable solution for connecting large-diameter and small-diameter pipe runs with standard female iron pipe threads. Built from durable malleable iron and finished in a protective black coating, this reducing coupling stands up to everyday use in both indoor and outdoor plumbing applications.
- 1-1/2 in. FIP
- 3/4 in. FIP
- Malleable Iron
- Black
- 300 psi
- 150°F
- Reducing Coupling
- Bagged
- Lead-Free
Why this reducing coupling matters: when you need to bridge a larger supply line to a smaller branch line, this 1-1/2 in. to 3/4 in. FIP connection provides a secure, leak-resistant transition. The female iron pipe threads on both ends mate with standard male-threaded fittings, nipples, or adapters, making it a versatile choice for retrofit projects, repairs, or new installations in residential and commercial settings.
Practical scenarios you’ll appreciate include tying into a hot or cold water circuit where a 1-1/2" line must be reduced to 3/4" for fixtures, appliances, or branch runs. The malleable iron construction delivers strength and resilience against vibration and pressure fluctuations, while the black finish adds a layer of corrosion resistance suitable for typical plumbing environments. With a maximum operating pressure of 300 psi and a temperature rating up to 150°F, it’s designed for standard water services and non-pressurized applications, helping you avoid over-specification on everyday jobs.
This product is ideal for:
- Bridging 1-1/2" mains to 3/4" branch lines in water supply runs
- Repairs and retrofits where existing male-threaded components require a compatible reducing coupling
- Residential and light commercial plumbing projects that stay within its pressure and temperature limits
Installation tips to get a reliable seal:
- Ensure threads are clean and undamaged before installation.
- Use appropriate thread sealant or PTFE tape on male threads to promote a tight, leak-free connection.
- Hand-tighten and then give a secure final turn with a wrench, taking care not to over-tighten and damage the threads.
- Verify the system is depressurized before installation and inspect for leaks after initial operation.
