TM 10-6640-239-13 5-14 5-9. CONTROL DEVICES (WATER SYSTEM). This task consists of: a.   Remove b.   Install INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) Soldering Kit (Appendix B, Section III, Item 2) Materials/Parts Required Teflon Tape, (Appendix E, Section II, Item 139) Reference TB-SIG-222, Soldering Methods and Equipment Equipment Conditions Water Pump Turned Off. Water Pressure Relieved by Opening Sink Faucet. REMOVE Remove Water System Control Devices.  See Figure 5-5. a. Remove threaded stopcock valves (1) by unscrewing valves from tees (2) or elbows (3) located in water system piping. b. To remove soldered/brazed valves or flow control devices, proceed as follows: (1)   Disconnect pipe union(s) (4) closest to control device to being removed. (2)   Remove pipe section with control device attached. (3)   Unsolder/unbraze control device from piping. INSTALL Install Water System Control Devices.  See Figure 5-5. a. Apply teflon tape to male fittings.  Be sure to wrap tape in same direction as pipe thread. b. Install threaded stopcock valves (1) into tees (2) or elbows (3) located in system piping. c. To install soldered/brazed valves or flow control devices, proceed as follows: (1)   Solder/braze control device to piping. (2)   Install pipe section with control device attached. (3)   Connect pipe unions (4). d. Prepare and operate water system using internal water tank as source in accordance with procedures listed in paragraph 2-6j. e. Inspect for leaks and check for proper operation.