(1) Attach new o-ring (6), on filter assembly (5).  Install filter assembly (5) into trap body (7). (2) Install reducing nipple (4), tubing adaptor (3), tubing elbow (2) and adaptor (1). 6-25. Second Stage Trap Assembly (See Figure 8-22). The following paragraphs contain disassembly, cleaning, inspection, repair and replacement and assembly instructions for the second stage trap assembly. a. Disassembly.  Disassemble the second stage trap assembly only to the extent necessary to repair or replace a defective part or parts. (1) Remove two tubing adaptors (1 and 2), pipe tee (3), nipple (4), and reducing bushing (5), from trap body (16). (2) Remove tubing elbow (6), check valve (7), close nipple (8), reducer (9), elbow (10), street tee (11), reducer (12) and adapter (13) from trap body (16). (3) Unscrew and remove trap filter assembly (14) and o-ring packing (15) from trap body (16). b. Cleaning.  Refer to paragraph 6-3.a for general cleaning instructions. Take care not to damage the fine mesh filter screen. NOTE Do not allow parts to remain in dry cleaning solvents for extended periods of time or rust spots may form. (1) Thoroughly wash filter screen in solvent, per Federal Specification P-D-680, Type II. Allow filters to air dry. NOTE For best results, use ultrasonic cleaner, NSN 4940-00-164-8977, (Table 2-1), to clean filter screen. (2) Wipe out cavity of trap bodies with a lint- free cloth dampened in solvent, per Federal Specification P’-D-680, Type II. Allow bodies to air dry. c. Inspection.  Refer to paragraph 6-3.b for general inspection instructions. (1) Check the filter screen for damage such as breaks and plugging due to corrosion. (2) Check o-ring for deterioration, cuts, or other damage. d. Repair or Replacement.  Refer to paragraph 6- 3.c for general repair or replacement instructions. Do not allow solder to foul filter screw threads. (1) If screen is undamaged and screen-to- screw solder joint is broken, use a gas torch to silver solder screen to screw.  Use rosin residue remover to remove solder flux residue oil, and residue from trap filter. (2) If filter screen is damaged, replace the trap filter subassembly. (3) Replace damaged or defective fittings. (4) Replace a damaged or defective check valve. e. Assembly.  To assemble the second stage trap assembly, proceed as follows:   (1) Assemble o-ring (15) and trap filter (14) in top of trap body (16).  Install adaptor (13)in body (16). (2) Install reducing bushing (12) in body (16), assemble street tee (11) on bushing (12). (3) Assemble elbow (10) to run on tee (11). Assemble valve (7) to nipple (8), to reducing bushing (9), and install bushing (9) in branch of pipe tee (11).  Assemble elbow (6) to valve (7). (4) Install reducing bushing (5) in body, assemble hex nipple (4) to pipe tee (3), and install nipple (4) in bushing (5). Assemble adaptors (1 and 2) to pipe tee (3). 6-26. Third  Stage Trap Assembly (See Figure 8-23). The following paragraphs contain disassembly, cleaning. 6-32