General 139/4 Internal Pipe Wrench Set 4 Piece

Product Description

The GENERAL 139/4 is a 4-piece internal pipe wrench set designed to grip and turn pipe from the inside diameter, making it the go-to tool when external access is blocked or limited. Built from hardened steel, the set covers a pipe capacity range of 0.375 inches to 1 inch, with an overall length of 3.75 inches per wrench. Plumbers and pipefitters reach for internal pipe wrenches when removing broken nipples, extracting stub ends, or reinstalling short pipe sections flush with a fitting face. The hardened steel construction resists deformation under the torque loads typical in residential and light commercial plumbing work.

This set is suited for residential and light commercial plumbing applications where broken or recessed pipe sections need to be gripped internally for removal or reinstallation. The range of four wrench sizes allows a technician to work across common small-diameter pipe sizes in a single kit, eliminating the need to source individual wrenches for each pipe diameter encountered on a service call. Ideal for use in confined spaces such as wall cavities, valve boxes, and tight manifold assemblies.

Key Features

• Hardened steel construction resists deformation under high-torque conditions
• Internal gripping design allows use when external wrench access is not possible
• Covers pipe capacity range from 0.375 inches to 1 inch
• 4-piece set provides coverage across common small-diameter pipe sizes
• Compact 3.75-inch overall length suits confined installation spaces

Compatibility

Designed for use on standard small-diameter pipe and nipples in the 3/8-inch to 1-inch range, typical of residential and light commercial plumbing systems.

Installation Notes

Internal pipe wrenches are installed by a licensed plumber or qualified pipefitter. Always shut off the water supply and relieve system pressure before attempting to extract or reinstall any pipe section. Insert the wrench into the pipe bore, apply steady rotational force, and avoid impact loading that could crack cast or corroded pipe. Work complies with applicable IPC provisions for pipe installation and removal.