Midland Industries 129A-391FC2STL Bulkhead Connector Steel

Product Description

The MIDLAND INDUSTRIES 129A-391FC2STL is a steel bulkhead connector designed to pass fluid or gas lines through a panel, wall, or enclosure while maintaining a secure, leak-resistant seal on both sides. One end features a 1/4-inch female NPTF connection and the other a 1/2-inch male NPTF connection, allowing this fitting to transition between two different thread sizes at the bulkhead point. The all-steel construction delivers durability in demanding environments where brass may not be appropriate. Plumbers, pipefitters, and HVAC technicians install this type of fitting when routing lines through equipment panels or mechanical enclosures.

This bulkhead connector is suited for use in residential and light commercial mechanical systems where lines must pass cleanly through a panel or structural surface. Its NPTF thread form provides a pressure-tight seal through thread-form interference, reducing dependence on sealants in compatible applications. Typical installations include compressed air lines, hydraulic systems, fuel lines, and process piping where a panel pass-through fitting with two different port sizes is required.

Key Features

• Steel construction for strength in environments where corrosion resistance is secondary to mechanical durability
• 1/4-inch female NPTF x 1/2-inch male NPTF thread configuration transitions between two common pipe sizes at the bulkhead
• NPTF thread form provides pressure-tight seal through thread interference
• Bulkhead design allows secure through-panel installation with connections accessible on both sides
• Compact form factor suitable for tight mechanical enclosures

Compatibility

Designed as an OEM-style replacement or new-installation bulkhead fitting for systems using 1/4-inch female NPTF and 1/2-inch male NPTF threaded connections in steel pipe or tubing arrangements.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or qualified mechanical technician. Depressurize and isolate the system completely before removing or installing any fitting. NPTF threads are designed to seal on thread engagement, but applying an appropriate thread sealant or PTFE tape per system requirements and local mechanical codes is common practice. Do not overtighten, as steel threads can gall or distort if excessive force is applied.