TM 10-6640-239-13 4-85 4-38.    WATER SYSTEM COMPONENTS. This task consists of: a. Remove b. Install c. Test d. Adjust INITIAL SET-UP Tools Required General Mechanics Tool Kit, (Appendix B, Section III, Item 1) General Safety Instructions WARNING ELECTRICAL SHOCK Before  performing  any  maintenance  actions  on  electrical  equipment,  ensure  all electrical power has been turned off.  Failure to comply with this warning may result in serious injury or death. REMOVE 1. Remove Water Filter.  See Figure 4-27. NOTE Filter element replacement requires only that the bowl be unscrewed from filter cover. a. Set switch on pump controller to OFF. b. Open circuit breaker A15CB8 on Power Panel No. 2. c. Remove Air/Gas drying apparatus (Paragraph 4-61). d. Close prefilter valve (1) and postfilter valve (2) on each side of water filter (3). e. Remove cover nut (4) and lower filter bowl (5). f. Remove filter element (6). g. Disconnect two unions (7) securing water filter (3) to piping. h. Remove two screws (8), washers (9) and filter (3) from support bracket (10). 2. Remove Water Pressure Switch.  See Figure 4-28. a. Remove switch (1) cover, tag and disconnect switch leads. b. Remove lock nut from conduit (2) and remove conduit with switch leads. c. Unscrew pressure switch (1) from water piping union (3). 3. Remove Eyewash.  See Figure 4-29. a. Set switch on pump controller to OFF.  Actuate eyewash to relieve water pressure. b. Loosen retaining nut (1) on hose (2) and remove eyewash (3) from hose. 4. Remove Sink Drain.  See Figure 4-29. a. Disconnect union (4) at top of sink trap (5). b. Pop up the form fitting sink (6) from countertop. c. Remove sink drain tailpiece (7) from sink (6).