| Product Type: | Elbow |
|---|---|
| Size: | 4" |

Hi Dan. I do not see such an adapter offered by AO Smith, however Z-FLEX offers one (SKU: 2SVDSA04) - https://www.supplyhouse.com/Z-FLEX-2SVDSA04-4-Z-Vent-Single-Wall-to-Double-Wall-Adapter We cannot guarantee it will work with AO Smith venting pieces, so it is advised to use Z-FLEX venting when connecting to the adapter.
Yes, it is AL-29C stainless steel.
The dimensions listed are 5.22" from the center of the female connection over to the insertion depth of the male, and 6.66" from the center of the male connection over to the end of the female.
This is single wall. Double wall would be part 2SVDE0490.