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The VALUE COLLECTION -12148-5 is a 1-inch NPT square plug used to seal threaded pipe openings in high-pressure piping systems. Forged from carbon steel with a black finish, this plug carries a Class 3000 pressure rating at 3000 psi, making it suitable for demanding liquid and gas service. It is installed by licensed plumbers and pipefitters working on industrial, commercial, or heavy mechanical systems where a secure, pressure-rated pipe closure is required. Each order is packaged in a quantity of 5.
This square plug is used to cap off 1-inch NPT threaded pipe ends in ferrous piping systems handling liquids or gases under high pressure. Typical applications include mechanical rooms, boiler piping, process lines, and industrial fluid distribution systems. The black finish is standard for carbon steel pipe fittings used in non-decorative service environments. The NPT thread form ensures a tapered, pressure-tight connection when installed with the appropriate thread sealant or tape.
Designed as a standard OEM-style replacement or new-installation fitting for 1-inch NPT threaded ferrous pipe systems rated to Class 3000 service.
Installation is performed by a licensed plumber or pipefitter. Depressurize and isolate the pipe section fully before installing or removing any threaded fitting. Apply an approved thread sealant or PTFE tape to the NPT threads before installation. Follow applicable plumbing and mechanical codes, including IPC and IFGC guidelines, for pressure-rated pipe fitting installation.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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