Product review (5 stars): Prevent instead of Repair
Slightly rigid plastic material, easily drilled through for placement of the electrical wire for the dishwasher (then caulked the hole), easy to slide the dishwasher back onto the pan.  We also caulked the front lip where the pan touches the floor so that if there is a future leak, the water should come out and be more visible on the kitchen floor instead of seeping into the hardwood floors under the dishwasher.  I don't know why all home builders don't install this $20-something item to prevent water damage.