Octagon deck boxes

[101010]

any suggestions / a collar box for extending a concrete deck box . With 3/4 KO.

 

[infinity]

You might be able to use these, just remove the outside nail down ears.

http://www.hubbell-rtb.com/p-62-concrete-rings-ceiling-boxes-cover-plates

Or one of these adapters and mount a 4" octagon box over it.

http://www.hubbell-rtb.com/p-63-concrete-rings-ceiling-boxes-cover-plates

 

[AHMED BAYOUMI]

thank you

 

[sandsnow]

What about a regular old 4/0 extension box? This one has 1/2 and 3/4 KOs

http://www.tnb.com/ps/fulltilt/index.cgi?part=4ODEXTSPL