Midland Industries 66768 Hex Socket Countersunk Plug 1-1/2 in

Product Description

The MIDLAND INDUSTRIES 66768 is a hex socket countersunk plug designed to seal threaded pipe openings in galvanized steel piping systems. It connects via a 1-1/2 inch MNPT thread with a 1-1/2-11-1/2 thread specification and is rated for a 150 lb pressure class. The plug is manufactured from steel with a zinc-plated finish, providing corrosion resistance in typical plumbing and mechanical installations. At 0.83 inches in length and weighing approximately 0.45 pounds, it is a compact, durable fitting. A 1 inch internal hex socket accepts a standard hex key for installation. Plumbers and pipefitters install this fitting during system assembly, pressure testing, or when capping unused branch outlets.

This plug is suited for residential and light commercial piping applications where steel threaded fittings are required. It is commonly used in gas, water, and air distribution systems that specify ASME B16.14 - 1991 dimension standards. Typical installation scenarios include capping open tees, crosses, or elbows during rough-in or system modification work. The zinc-plated finish makes it appropriate for use in galvanized steel fitting assemblies where consistent material standards are required across the system.

Key Features

• 1-1/2 in MNPT connection with 1-1/2-11-1/2 thread form for standard threaded pipe engagement
• 150 lb pressure class rating suitable for typical plumbing and mechanical piping systems
• 1 inch hex socket drive for installation with a hex key or Allen wrench
• Zinc-plated steel construction provides corrosion resistance in standard service environments
• Meets ASME B16.14 - 1991 dimension standards for consistent fitment with compliant fittings
• Operating temperature range of -20 to 350 degrees F

Compatibility

Designed as an OEM-style replacement or new-installation component for 1-1/2 inch MNPT threaded pipe systems conforming to ASME B16.14 - 1991 standards in galvanized steel fitting assemblies.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable IPC and IFGC code requirements for the system type. Depressurize and isolate the piping system before installing or removing any threaded plug. Apply appropriate thread sealant or PTFE tape to the male threads before engagement. Do not overtighten; use the hex socket drive with a properly sized hex key to achieve a secure, leak-free seal without damaging the fitting or pipe threads.