"Great box for connecting 20mm plastic conduit to plastic trunking. Only gave 4* on performance because the knockout didn't work for the 20 mm hole and had to be drilled. I box was badly broken because of this so beware."
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Review 6 for Tower 1G Surface Box with 20mm knock out and mini knockout
"This surface box only has ONE circular knockout on one of its sides (there is another one on its back/base). This greatly limits its functionality, and to be honest it is the first time I have come across a surface box designed for conduit that only has ONE knockout for circular conduit entry on its side. This box can therefore only be used if your wiring is terminating at this box."