3/8 inch Galvanized Iron Coupling Female x Female

3/8 inch Galvanized Iron Coupling – Threaded Fitting for Low-Pressure Applications

The 3/8 inch Galvanized Iron Coupling is a straight pipe fitting used to connect two male-threaded pipe ends of equal diameter. Constructed from galvanized iron, it provides moderate corrosion resistance and is suitable for non-potable water distribution, air lines, and low-pressure gas systems in residential and light commercial environments.

This coupling features NPT (National Pipe Taper) threads conforming to ANSI/ASME B1.20.1 standards. The galvanized coating helps protect the base metal from oxidation in dry environments, although it is not intended for systems conveying potable water or for environments with aggressive corrosives.

Product Characteristics

• ✅ Material: Galvanized cast iron
• ✅ Nominal Size: 3/8 inch
• ✅ Connection: Female NPT x Female NPT
• ✅ Standard: Threads comply with ANSI/ASME B1.20.1
• ✅ Finish: Hot-dip galvanized exterior

Application Scope

Commonly used in:

• Low-pressure water supply lines (non-potable)
• Compressed air systems
• Low-pressure steam or gas distribution where code permits
• Closed-loop hydronic heating applications

Installation Guidelines

Apply appropriate thread sealant (PTFE tape or pipe joint compound) during assembly to ensure a leak-resistant joint. Tighten using pipe wrenches, taking care not to overtighten and crack the fitting. Confirm compatibility with connected piping material and local code requirements prior to installation.

Note on Material Selection

Galvanized iron fittings should not be used in contact with copper piping due to galvanic corrosion risk. Not suitable for underground or potable water use unless explicitly rated as compliant.