Bert Coules wrote:
And another follow-up. I just spoke to a local retailer asking about the
lever connectors. They only sell them in bags of fifty, but in any case he
advised against them, especially for a connection that's going to be sealed
inside a wall. He recommended a conventional round screw-terminal junction
box, either the usual size or a 2.5" diameter model.

That's actually entirely the wrong way round. Genuine Wago connectors
*can* be used for inaccessible joints (if they're the right Wagos in
the right sort of box), screw terminals in a junction box are *not*
allowed to be inaccessible.

--
Chris Green
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