Ford E4OD Transmission Cooler Line Check Valve Fitting - FOTZ-7D174-B / -C

This document is a single-page illustrated parts reference showing a Ford transmission case cooler line fitting that incorporates a check valve (check ball). A line drawing depicts a hex-head threaded fitting with a check ball visible inside the bore. Two callout labels identify the correct part number based on cooler line diameter: for 5/16-inch cooler lines, the fitting is Part No. FOTZ-7D174-B, and for 3/8-inch cooler lines, the fitting is Part No. FOTZ-7D174-C. The document contains no year, model, engine, or torque information — only the fitting illustration and the two part numbers keyed to line size. It was uploaded to a 1990 Ford Bronco gallery alongside other E4OD transmission cooler and check-ball documents, suggesting it is used as a reference for selecting the correct check-valve cooler line fitting when servicing or upgrading the transmission cooling system. A reader can learn which Ford service part number to order depending on whether their transmission cooler lines are 5/16" or 3/8" diameter, and that this fitting threads into the transmission case and contains an integral check valve.