This is the mains cable (you may call it a flex or a cord) to suit any model of Dyson DC25.
3 pin UK plug, two core and 0.75mm. It has the correct male and female spade terminals on there too. You do have to reuse the plastic spade insulation covers and the stowing clip from your old flex.
You need a T15 screwdriver to open the switch housing - if you need one, you can find them in the related products below.
Important: If you are buying a flex, we expect that you are competent enough to be able to fit it safely and make any necessary electrical connections. Fitting a flex is not an amateur job! If you are in any doubt whatsoever, do consult an electrician.