Fixture outlet box

An outlet box assembly comprising:

• a base that defines a base through-hole, the base having a first base side and an opposite, second base side, the base including a first circumferential wall and a second circumferential wall, the first and second circumferential walls extending substantially parallel to each other and are radially spaced apart from each other;
• and
• a connection assembly configured to attach to the base through the base through-hole, the connection assembly comprising:
• a connector comprising a connector body, the connector body comprising an inner surface that defines a passage with one or more internal threads positioned along the inner surface;
• and
• an adapter comprising one or more external threads configured to engage with the one or more internal threads of the connector body, the adapter further defining at least one longitudinal slot configured to allow the adapter to radially compress when the adapter is attached to the connector, the adapter including a plurality of longitudinally-extending protrusions spaced apart about a circumference of the adapter, the plurality of longitudinally-extending protrusions defining at least one notch positioned between two of the plurality of longitudinally-extending protrusions;
• wherein the base includes a connecting wall that extends radially between and connects an outer surface of the first circumferential wall and an inner surface of the second circumferential wall.