Plumbing trap (1-4)

I think it could be either:

Which length description are you looking for?:

1-4

u-bend

(Other definitions for u-bend that I've seen before include "Waste pipe gas trap" , "Air-trap in a pipe" , "Trap section of waste pipe" , "Waste pipe feature" , "Plumber's air trap" .)

I've seen this clue in The Times.

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