Midland Industries 66775 Hex Head Plug 1 in Mnpt 150 Lb

Product Description

The MIDLAND INDUSTRIES 66775 is a solid hex head plug designed to cap off open pipe ends and fittings in plumbing, gas, and industrial piping systems. It features a 1-inch male National Pipe Taper (MNPT) connection with a 1-11-1/2 thread pitch, meeting ASME B16.14-1991 dimensional standards. Constructed from steel with a zinc-plated finish for corrosion resistance, this plug is rated for a pressure class of 150 lb and an operating temperature range of -20 to 350 degrees F. Plumbers, pipefitters, and mechanical contractors install this fitting when blanking off a pipe run or isolating a branch during system testing or permanent closure.

The 66775 is suited for residential and light commercial plumbing, hydronic heating, compressed air, and low-pressure gas piping applications where a threaded closure is required. Its hex head design allows installation and removal with standard hex wrenches or pipe wrenches, making it a practical choice for both permanent installations and service work. The zinc-plated finish provides additional protection in damp or mildly corrosive environments.

Key Features

• Solid steel construction with zinc-plated finish for corrosion resistance
• 1-inch MNPT connection with 1-11-1/2 thread pitch for secure, leak-tight sealing
• 150 lb pressure class rating suitable for standard piping systems
• Operating temperature range of -20 to 350 degrees F
• Hex head design allows installation with standard wrenches
• Meets ASME B16.14-1991 dimensional standards

Compatibility

Designed as an OEM-style replacement or direct-install fitting for 1-inch MNPT threaded pipe systems rated at 150 lb pressure class in galvanized steel fitting assemblies.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable codes such as the International Plumbing Code (IPC) or International Fuel Gas Code (IFGC). Always depressurize and isolate the pipe section before installing or removing threaded plugs. Apply an appropriate pipe thread sealant or PTFE tape to the male threads before installation. Do not overtighten, as this can crack fittings or damage threads in the mating connection.