YES – failure to use the Depth Gauge / Deburring Tool will void your warranty. Use of this tool is a requirement in accordance with the Installation Instructions and Jointing Procedures. The Depth Gauge / Deburring Tool has two main roles, 1. It marks the pipe with a feint line to confirm a “Safe Bury” insertion depth and 2. It deburs the pipe end to prevent damage to the “O-Ring” allowing easy insertion.