Grass Gator Universal Bump and Feed Replacement Trimmer Head for Gas Weed Trimmers. Excellent for all gas trimmers, the Grass Gator Universal Bump & Feed Trimmer Head is an ideal replacement for original bump and feed trimmer heads. It can trim both grass and weeds and is capable of handling 0.09 to 0.10 inch in diameter line. This replacement trimmer head fits 99% of all gas trimmers. Grass Gator replacement heads are also easy to install and easy to use.