OEM part number

808000023 Concentric vent adapter 80/125 mm (parallel to concentric conversion)

Rinnai part 808000023 (Concentric flue adapter 80/125 mm). Listed for 8 models below.

Rinnai E-Combi condensing combi boiler (E50CRN, E75CRN/CRP, E110CRN/CRP)

Concentric vent adapter 80/125 mm (parallel to concentric conversion). Fits 1 of 8 models:

Also listed as spare item 78

Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), page 34, 80. Full E-Combi parts list

Rinnai E-Combi condensing combi boiler (E50CRN, E75CRN/CRP, E110CRN/CRP)

Concentric flue adapter 80/125 mm. Fits all 8 models in the series:

E110CR E110CRN E110CRP E50CR E50CRN E75CR E75CRN E75CRP

Spare parts list item 78

Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), page 80. Full E-Combi parts list

Part numbers are taken from the manufacturer’s published repair parts documents and are listed so you can identify the right part. Manufacturers replace and supersede numbers over time, so confirm the number with your distributor before you order, and use factory-authorized parts on equipment under warranty. Replacing gas, electrical and refrigerant parts is work for a licensed technician. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.