The Commission is proposing to amend A.A.C. R20-5-401 (Applicability), A.A.C. R20-5-402 (Definitions), A.A.C. R20-5-404 Standards for Boilers, Lined Hot Water Heaters and Pressure Vessels), A.A.C. R20-5-406 (Repairs and Alterations), A.A.C. R20- 5-407 (Inspection of Boilers, Lined Hot Water Heaters, Direct Fired Jacketed Steam Kettles and Issuance of Inspection Certificates), A.A.C. R20-5-408 (Frequency of Inspection), A.A.C. R20-5-409 (Notification and Preparation for Inspection), A.A.C. R20-5-410 (Report of Accident), A.A.C. R20-5-411 (Hydrostatic Tests), A.A.C. R20-5-412 (Automatic Low-water Fuel Cutoff Devices or Combined Water Feeding and Fuel Cutoff Devices), A.A.C. R20-5-413 (Safety and Safety Relief Valves), A.A.C. R20- 5-415 (Boiler Blowdown, Blowoff Equipment and Drains), A.A.C. R20-5-416 (Maximum Allowable Working Pressure), A.A.C. R20-5-417 (Maintenance and Operations of Boilers, Hot Water Heaters and Direct Fired Jacketed Steam Kettles), A.A.C. R20-5- 418 (Non-standard Boilers), A.A.C. R20-5-419 (Request to Reinstall Boiler or Lined Hot Water Heater, A.A.C. R20-5-420 (Special Inspector Certificates under A.R.S. § 23-485), A.A.C. R20-5-429 (Variance), A.A.C. R20-5-430 (Forced Circulation Hot Water Heaters), A.A.C. R20-5-431 (Code Cases) and A.A.C. R20-5-432 (Historical Boilers). Additionally, the Commission is proposing to repeal A.A.C. R20-5-403 (Boiler Advisory Board).