Sentinel Pro Development Inc. is the manufacturer of the SENTINEL Drain Guard. A high quality yet inexpensive sewage backflow device. The device is easy for homeowners to install and prevents sewage backflow into your home. PREVENTING SEWAGE BACKFLOW FROM ENTERING YOUR HOME! Changing weather patterns and severe rain storms combined with the increased failure of aging municipal infrastructure are causing expensive flood damage in urban basements. According to the Insurance Bureau of Canada, water damage has surpassed fire as the leading cause of personal property losses. Typical insurance policies have a $2000.00 deductible for sewer backflow damage, so even a deductible is expensive --- but a sentimental property loss can cost more than money! EVERY HOME IN NORTH AMERICA WITH A BASEMENT SHOULD HAVE A SENTINEL INSTALLED.