Value Collection B291 100 4 in Class 150 Malleable Iron Square Plug

Product Description

The VALUE COLLECTION B291 100 is a 4-inch Class 150 malleable iron square plug designed to seal and cap threaded pipe ends in black iron piping systems. Rated at 150 psi, it uses a standard threaded end connection for secure, pressure-tight closure. The black finish is compatible with black iron pipe installations common in gas, water, and industrial distribution lines. Licensed plumbers and pipefitters install this fitting as part of routine system construction, maintenance, and pressure testing. Its malleable iron construction provides the toughness and thread integrity required in demanding trade applications.

This square plug is suited for residential and light commercial piping systems where Class 150 threaded fittings are specified. Typical applications include capping unused branch outlets, isolating sections of a gas or water distribution system, and blanking off ports during pressure testing. The 4-inch size serves main-line and large-branch piping configurations common in commercial plumbing and mechanical rooms.

Key Features

• 4-inch fitting size for main-line and large-branch piping applications
• Class 150 pressure rating at 150 psi for threaded iron pipe systems
• Malleable iron construction delivers strength and reliable thread engagement
• Black finish compatible with standard black iron pipe systems
• Threaded end connection for straightforward installation without special tooling
• Meets multiple standards including FM Approved and cULus Listed

Compatibility

Designed as an OEM-style replacement and standard fitting for Class 150 threaded black iron pipe systems in residential and commercial plumbing and gas distribution applications.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable IPC and IFGC code requirements. Isolate and depressurize the affected pipe section before installing or removing any threaded fitting. Apply an approved thread sealant or PTFE tape to the male threads before installation. Do not overtighten; use a pipe wrench sized appropriately for the 4-inch fitting to achieve a secure, leak-free connection without damaging the threads.