2x4 wall box for drywalls

[Elec-JP]

I have light switches I need to install in an office space with drywalls and they need the switches to be flush with the walls. My question is where I could find wall boxes which are designed to fit into the drywalls or is there a method I could use to install a normal wall box and ensure it won't fall out

[GCE]

Fix a normal KO box to the drywall strut with a self tapper before they put the front boards on
Alternatively if boards are already on , cut the hole size of the KO box just a touch smaller and clamp the box woith the light switch plate.
If you have conduit and adaptors glued in place it should also stay put

[Dylboy]

Ya what GCE said, if wall already in the clamp method works well and we have used many times.

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[Elec-JP]

thank you very much

[skatingsparks]

Or just use these from crab tree..... So easy to use and quick. No struggling.

https://crabtree.co.za/product/cms-drywall-box/

The UK has had these for for over 20 years. Saw them this side for the first time last year. Brilliant.

[Thys LOW Elektries]

Try the CMS Drywall Box from Crabtree https://crabtree.co.za/product/cms-drywall-box/
Hope this is what you were looking for