A: No, there are not adapter plates that are designed to be used with this junction box.
A: It certainly would work based on the dimensions your handyman provided. However, just to be sure, I would show him the part before purchasing.
|Name||3/4 in. PVC Type-X Round Junction Box with Cover||4 in. x 4 in. x 4 in. PVC Junction Box||98 cu. in. PVC Gray Non-Metallic Floor Box for Concrete Pour with 3/4 in. and 1 in. Hubs, 1-Pack||14 cu. in. 1-Gang PVC Old Work Electrical Outlet Box, (12-Pack)|
|Packaging Type||Consumer Packaging||Consumer Packaging||Consumer Packaging||Consumer Packaging|
|Box Type||Junction box||Junction box||Floor Box||Wall box|
|Trade Size (in.)||3/4||4||Other||#0|
|Number of Gangs||0||0||0||1|
|Number of Knockouts/Pryouts||4||0||0||4|
|THD SO SKU||1001307725||1001654140||1000518589|
|View Product||View Product||View Product||View Product|