TM 9-2320-209-20-3-3 1. Put upper coupling part (1) and lower coupling part (2) in place and line up screw holes. Put two screws (3) in place. Check that coupling will hold tube (4) to discharge valve (5). 2. Using 7/8-inch wrench, screw on and tighten two nuts (6). GO TO FRAME 3 18-71