TM 9-2320-209-20-3-3 b. Replacement. FRAME 1 1. Put gaskets (1) on flanges (2 and 3). Put gate valve (4) between gaskets and line up screw holes. 2. Put eight screws (5) through flanges (2 and 3) and valve (4). Using wrenches, screw on and tighten eight nuts (6). END OF TASK 18-91