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De Neef®, a division of GCP Applied Technologies, is a global leader in underground leak sealing, water blocking and soil stabilization solutions.

Product innovation and applied knowledge for solving highly complex problems in the most challenging situations for more than 35 years, De Neef® puts construction back on track fast and provides customers lasting peace of mind.

Fast, Proven and Durable, De Neef® stops leaks where they start​


See the benefits of using De Neef® in your project​​​​​​​​​​​​​​​​​