Midland Industries 67777 Hex Head Plug 1-1/2 in Mnpt 150 Lb

Product Description

The MIDLAND INDUSTRIES 67777 is a solid hex head plug designed to seal off open pipe ends in black steel piping systems. It features a 1-1/2 in Male National Pipe Thread (MNPT) connection with a 1-1/2-11-1/2 thread form and a 2 in hex drive for standard wrench engagement. Rated at 150 lb pressure class and manufactured from black steel, this plug meets ASME B16.14-1991 dimensional standards. It has an installed length of 0.51 inches and is rated for service temperatures from -20 degrees F to 350 degrees F. Licensed plumbers, pipefitters, and HVAC technicians install this fitting in gas, water, air, and steam distribution systems.

This plug is used in residential and commercial piping applications wherever a threaded pipe port needs to be capped or blanked off. Common install scenarios include capping branch outlets on black steel gas mains, closing unused tee ports in hydronic heating systems, and sealing test ports after pressure checks. The 150 lb pressure class and steel construction make it suitable for low-pressure gas and fluid service lines common in both mechanical rooms and field piping runs.

Key Features

• 1-1/2 in MNPT connection with 1-1/2-11-1/2 thread form for standard black steel pipe compatibility
• 150 lb pressure class rating for low-pressure gas, air, water, and steam service
• 2 in hex drive allows engagement with standard pipe wrenches or hex sockets
• Meets ASME B16.14-1991 dimensional standards
• Black steel construction rated from -20 degrees F to 350 degrees F
• Solid plug design with no through-bore - full dead-end seal

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 1-1/2 in MNPT black steel pipe systems rated at 150 lb pressure class per ASME B16.14-1991.

Installation Notes

Installation is performed by licensed plumbers, pipefitters, or HVAC technicians. Shut off and depressurize the system completely before removing or installing any threaded pipe fitting. Apply an appropriate thread sealant or PTFE tape to the male threads before engagement, following local code requirements such as the IFGC or IPC. Do not overtighten; use a torque appropriate for the pipe material and size as specified by the applicable code or fitting manufacturer guidelines.