Hydraulic Tensioner. Inserts into lower passenger-side of timing cover. Helps prevent timing chain rattle by pivoting short rail against side of timing chain. Fits: 1.5L, 1.9L, 2.0L, 2.2L & 2.4L CIH Opel engines. Installs using a 27mm or 1 1/16" wrench. Imported item.