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PROJECT - Vacuum Joint Testing Box Culverts
  Vacuum Joint Testing Box Culverts

This is a picture of a Joint Tester that can vacuum test the joints in V bottom box culvert pipe (4 sided) used for one of our current projects.

It rolls from joint to joint, when centered on the joint, the two end bladders are inflated, and a vacuum is applied to the space between the bladders and the joint.