Quick & Effective Gopher, Mole, & Vole Control Using Your Engine Exhaust - The Crittergetter HO3 Is 3-inches in Diameter and 50-feet Long Use engine exhaust to eliminate your pest! Our HO3 is 3-inches in diameter &amp; 50-feet long - Please see the important sizing instructions below. The Crittergetter is appropriately sized to accommodate the airflow from your tailpipe. Similar products using undersized hose can cause backpressure leading to costly engine repairs. Safe, efficient &amp; easy to use.