ACDelco TF331 Professional Automatic Transmission Fluid Filter Kit Has an air-tight seal that virtually eliminates loss of line pressure Has felt filter media that helps deliver high-filtration efficiency, excellent fluid flow, and long filter life Has filter fibers that are infused with phenolic resin, adding strength and the ability to withstand fluid temperatures at the highest level of the transmission's normal operating range Has an air-tight seam that virtually eliminates loss of line pressure Has felt filter media that helps deliver high-filtration efficiency, excellent fluid flow, and long filter life Has filter fibers that are infused with phenolic resin, adding strength and the ability to withstand fluid temperatures at the highest level of the transmission's normal operating range