"These adaptors were purchased to connect trunking to backboxes for light switches. The threaded portion passed through the knockouts very easily and the wiring was easy to feed through. The only problem I had was when I suspended a piece of trunking horizontally from the adaptor and the thread snapped but I am sure that the product was not designed to bear weight like this!"
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Review 3 for Tower Female Adaptors 20mm White Pack of 2
"There's not a lot of thread on these adaptors and they barely locked on the BG consumer unit and surface mount box I used them with - tighten up the ring too much and they slip off the thread. Could do with perhaps 1-2mm more thread."