Step 2 · Cut Wall Opening
Place the washing machine outlet box against the drywall at your marked location and trace the outline of the box's body (not the wider faceplate). Use a level to ensure your traced lines are perfectly straight. With a drywall saw, carefully cut along the pencil lines. Start with a shallow plunge to make sure the area is clear of obstructions. Once you've cut all four sides, gently remove the piece of drywall to reveal the wall cavity.