Added explanation regarding the two LP plugs in the 455 regulator body. Various grammatical corrections.
Updated wrench size from 1" to 15/16" in step six in 1.1.5 455 Balanced Regulator Bias Adjustment Field Service with Demand Regulator on Helmet.
Updated the layout and cross references due to splitting the INTRO module into four separate modules.
Updated step 26 in section 1.3 455 Balanced Regulator Bias Adjustment Field Service with Demand Regulator on Helmet.
Updated references to 1.3.1 Removal of the Bent Tube Assembly on pages 5 and 13, which is the correct regulator model.
Document #190619003 Original code for CE Mark.
Updated the material of the 510-776 exhaust valve.
Updated extensively throughout.
Updated tools required on page 455BAL-22 section 1.5.4 Installing the Main Tube into the Regulator Body and 455BAL-27 and added steps six and seven on page 455BAL-29 section 1.6 Installing the 455 Balanced Regulator.
Added, "Lubricate the O-ring and shaft bearing washer" and, "A Rag or Cloth" in the tools required for section 1.5.2 Flex Knob Reassembly.
Updated the cross references to the torque specs due to the splitting of APNDX into three separate modules.
Updated the, "Exploded view of 455 Balanced regulator" diagram on page 455BAL-3 and "Details of the 455 Balanced main tube and associated parts" diagram on pages 455BAL-12 and 455BAL-18 and removed the extra O-ring and new balance spacer. Updated the, "Do not over lubricate the O-rings on the balance spacer" image on page 455BAL-19. Updated step 2 and 4 in section 1.5.3 Main Tube Components Reassembly and removed the extra O-ring reference. Updated sections 1.3 455 Balanced Regulator Removal from Helmet or BandMask, 1.6 Installing the 455 Balanced Regulator onto the Helmet or BandMask (added, "or BandMask" to section headers).
Updated step 9 and images in step 10 of section 1.5.4 Installing the Main Tube into the Regulator Body. Updated step 7 and associated images in section 1.5.5 Regulator Cover Retainer Assembly Reassembly. Updated image in step 8 of section 1.6 Installing the 455 Balanced Regulator onto the Helmet or BandMask.
Removed 1/8 from the "Diagram of maximum lever arm travel" and step six in section 1.2.1.1 Purge Test on page 455BAL-2 and step six in section 1.2.1.2 Lever Play. Updated steps six and seven and associated images in section 1.5.5 Regulator Cover Retainer Assembly Reassembly starting on page 455BAL-26.
Updated layout.
