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131 0212 Lock09b Z

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09a & b. With a flick of this military-spec switch, the Offrotec locker shifts from a daily-driver-friendly open differential to a traction-terror spool. Plumbing the system is easy as you only have to hook up three vacuum lines on the back side of the switch: one to lock the diff, one to unlock, and one from a source of vacuum. In our case we used engine vacuum, but diesels can use an auxiliary vacuum pump--something most of them have anyway.