They come in two flavours one is a sewer pipe with embrasures cut out and no roof which most people call a Norcon but is actually a Croft pillbox or technically known as a CP/6/40/111, the other is a fully prefabricated variety like the one shown made of curved segments which could also have a domed roof, which is actually a Norcon like this one. The two seem to be interchangeably named though.
RAF Southrop - Type NORCON by Jonathan Maisey, on Flickr
RAF Southrop - Type NORCON by Jonathan Maisey, on Flickr
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