Anvil 0318905122 Cast Iron Square Plug 4 in Fpt Class 125

Product Description

The ANVIL 0318905122 is a 4-inch cast iron square plug used to seal the end of a female pipe thread (FPT) connection in piping systems. Rated at Class 125 with a 125 psi pressure rating, this plug is built for use in liquid and gas service lines where a reliable, permanent or semi-permanent closure is required. The black finish is standard for cast iron pipe fittings used in gas distribution and general-purpose piping. Licensed plumbers and pipefitters install this type of plug during system commissioning, pressure testing, and service isolation work.

This square plug is suited for residential and light commercial piping applications, including natural gas supply lines, water distribution, and low-pressure steam systems. The square head drive allows installation and removal with a pipe wrench or socket wrench without requiring special tooling. It is a Class 125 fitting, consistent with standard cast iron pipe fittings used in threaded iron pipe systems throughout commercial and residential construction.

Key Features

• 4-inch FPT end connection seals female-threaded pipe openings
• Class 125 rating with 125 psi liquid and gas pressure capacity
• Cast iron construction for durability in gas and liquid service
• Black finish standard for threaded iron pipe fitting systems
• Square head design accepts pipe wrench or socket for installation and removal

Compatibility

Designed as an OEM-style replacement fitting for Class 125 cast iron threaded pipe systems using 4-inch FPT connections in liquid and gas service applications.

Installation Notes

Installation is performed by a licensed plumber or pipefitter in accordance with applicable IPC or IFGC code requirements. Shut off gas or water supply and depressurize the line before installing or removing the plug. Apply an appropriate thread sealant or PTFE tape to the male threads before engagement. Do not overtighten; use a pipe wrench for final seating without impact force.