Replacement 5/8-to-4/7 reducer kit for Napoleon gas stoves. OEM Napoleon part # 4758AK
Napoleon BHD4 5/8 to 4/7 Reducer Kit (4758AK)
Model Compatibility
Fits These Models
Manuals & Documents
Manuals for the Ascent Series are being added to our manuals library. Need one now? Ask us or call 406-272-9850.
Before you order
This part is listed for the Napoleon Ascent Series. Check the model name and serial number on your appliance’s rating label and make sure they match — Napoleon built many models in more than one version (and gas models for natural gas or propane), and some parts changed between versions.
Not sure it’s the right part? Call 406-272-9850 or send us your model and serial number and we’ll confirm it before you order. Or browse all Napoleon Venting System Parts.
More parts for the Napoleon Ascent Series

Napoleon 4″ Exhaust Flue Pipe Assembly (W010-3490-SER)
SKU W010-3490-SER
Fits Ascent Series, Ascent X Series
Napoleon Vent Cover Plate (W500-0837)
SKU W500-0837
Fits Ascent Series, Ascent X Series
Napoleon B35 & GX70NTE-1 Firestop (W010-3348)
SKU W010-3348
Fits Ascent Series, Ascent X Series

Napoleon Restrictor Plate (RP4)
SKU RP4
Fits Ascent Series, Ascent X Series, GDS20 Arlington, GDS60 +2 more
Napoleon B46 & HD46-2 Safety Barrier Assembly (W010-3795-SER)
SKU W010-3795-SER
Fits Ascent Series, High Definition Series

Napoleon SIT Pilot Assembly – NG (W010-0801)
SKU W010-0801
Fits Ascent Series, Ascent X Series, B36DF, BGD33 +26 more

Napoleon B46 Safety Screen (W565-0228-SER)
SKU W565-0228-SER
Fits Ascent Series

Napoleon SIT Pilot Tube with Fittings (W720-0062)
SKU W720-0062
Fits Altitude X Series, Ascent Linear Series, Ascent Series, Ascent X Series +41 more