Midland Industries 65421 4in Fpt Malleable Iron Coupling 150lb

Product Description

The MIDLAND INDUSTRIES 65421 is a black malleable iron coupling designed for joining two 4-inch female pipe thread (FPT) connections in piping systems operating at up to 150 lb pressure class. Machined to ANSI B16.3 dimensional standards, this fitting delivers reliable, leak-resistant joints in gas, water, and general industrial piping applications. The malleable iron construction withstands a working temperature range of -20 to 350 degrees F, making it suitable for a broad range of service conditions. At 5.585 pounds and measuring 5.35 inches wide by 3.65 inches tall, this is a full-bodied fitting built for demanding installations.

This coupling is used in residential and commercial plumbing, gas distribution, and mechanical piping systems where a straight in-line connection between two threaded pipe runs is required. The 4-8 thread pattern ensures consistent engagement with standard pipe threads. Typical applications include black iron gas line assemblies, steam and condensate return lines, and industrial process piping where malleable iron fittings are specified per code or engineering design. Licensed plumbers, pipefitters, and gas fitters are the primary installers of this fitting.

Key Features

• 4 in FPT x 4 in FPT configuration for straight in-line pipe joining
• Malleable iron construction rated to 150 lb pressure class
• Conforms to ANSI B16.3 dimensional standards
• Service temperature range of -20 to 350 degrees F
• Black finish suitable for gas and hydronic piping systems
• 4-8 thread pattern for standard pipe thread engagement

Compatibility

Designed as an OEM-style replacement or new-installation fitting for black iron threaded piping systems using 4-inch nominal pipe size conforming to ANSI B16.3 standards.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or gas fitter in accordance with applicable local codes, IFGC, or IPC requirements. Shut off all gas or fluid supply and depressurize the system completely before removing or installing pipe fittings. Apply an appropriate thread sealant or PTFE tape rated for the service medium to all male threads before assembly. Do not over-tighten; use a pipe wrench sized for 4-inch fittings and follow standard hand-tight-plus-turns practice per the applicable code.