The MP1WWM Within Wall Mounting Plate helps eliminate unsightly gaps between the faceplate and mounting plate and provides an increased level of stability and protection for low-voltage installations. The innovative design features brightly colored yellow markers to indicate when it’s correctly installed, marking dimples to indent the drywall and securing pins to lock the plate into place and prevent it from moving.

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http://www.erico.com/products/MP1WWM.asp