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The Internal Wrench is able to grip onto 1"-2" pipes in situations where you cannot access the outer surface. It can hold closet spuds and bath, basin and sink strainers through 2". It can be used to install or extract Schedule 40 nipples. The jaws expand by eccentric action and are reversible for various sizes.
RIDGID® 31405 Internal Wrench, 4-1/2 in OAL, 1 to 2 in Jaw, Knurled Jaw, T Handle, Steel Jaw