STZ 310UCO-112 Coupling 1-1/2x1-1/2 in FIP Black Malleable Iron 6-Pack 300 PSI Lead-Free

The STZ 310UCO-112 black malleable iron coupling delivers robust, leak-resistant pipe connections for gas, air, oil, and potable water systems in residential and light commercial installations. Featuring dual 1-1/2-inch female iron pipe (FIP/NPT-F) threads, it enables secure, in-line joining of black steel or galvanized pipe segments with minimal flow disruption. Factory-tested to 300 PSI at 150°F and certified lead-free (NSF/ANSI 372), it meets modern safety and environmental standards while maintaining compatibility with legacy threaded systems. The hot-oiled black finish enhances corrosion resistance and provides a uniform, professional appearance in exposed mechanical rooms or utility closets.

Features  
- Dual 1-1/2 in FIP (NPT-F) threads for direct connection to standard black or galvanized steel pipe  
- Malleable iron body offers superior impact resistance and thread integrity vs. cast iron  
- Lead-free composition complies with NSF/ANSI 372 and Safe Drinking Water Act requirements  
- Rated 300 PSI @ 150°F—suitable for high-pressure air, natural gas, and cold-water lines  
- Hot-oiled black finish resists oxidation and maintains lubricity during installation  
- Smooth internal bore minimizes turbulence and pressure drop in fluid/gas flow  
- UL and FM listed for use in gas, air, and non-hazardous liquid systems  
- Threaded joints require standard pipe sealant (PTFE tape or pipe dope) for leak-free sealing  
- Compact, symmetrical design simplifies alignment in tight mechanical spaces  
- 6-pack ensures consistency and cost efficiency for multi-joint assemblies or spares  

Specifications  
- Brand Name: STZ  
- Model Name: STZ 310UCO-112  
- Part Number: 310UCO-112  
- Product Type: Pipe Coupling  
- Connection 1: 1-1/2 in FIP (NPT-F)  
- Connection 2: 1-1/2 in FIP (NPT-F)  
- Material: Black Malleable Iron  
- Finish: Hot-Oiled Black  
- Pressure Rating: 300 PSI @ 150°F  
- Temperature Range: -20°F to 150°F  
- Lead Content: <0.25% weighted average (lead-free per NSF/ANSI 372)  
- Certifications: UL Listed, FM Approved, NSF/ANSI 372 Compliant  
- Media Compatibility: Natural Gas, LP Gas, Air, Oil, Potable Cold Water  
- Restrictions: Not for hot water >150°F or steam service  
- Product Dimensions: 2.75 x 1.88 in (L x OD, approx.)  
- Item Weight: 0.9 lb per unit (5.4 lb total)  
- Package Quantity: 6  
- Packaging Type: Polybag  
- Country of Origin: China  
- UPC: 019442146870  
- Global Trade Identification Number: 00019442146870  
- Manufacturer: STZ Industries  

Product Application  
This coupling is used by plumbers, gas fitters, and HVAC technicians to join pipe runs in natural gas supply lines to appliances, compressed air systems in workshops, potable cold-water branches, and LP fuel lines in rural installations. Its lead-free certification makes it suitable for residential drinking water retrofits where code compliance is mandatory, while its 300 PSI rating supports demanding applications like pneumatic tool circuits or gas-fired equipment feeds. Commonly deployed in kitchen remodels, garage workshops, and multi-family service risers, it ensures reliable, code-compliant connections with long-term thread stability. The 6-pack supports bulk usage in standardized layouts (e.g., multi-unit gas meter headers) or maintains inventory for service vans—delivering trusted performance joint after joint.