What amp wire for diy wfp trolley ?

[Marky]

Hi all, sorry for my ignorance but wanted to check if there is a certain amp of wire needed for a diy trolley set up with a 12v battery and pump ? Seen all the vids but just wanted to check (they all seem blue and red ), I,ve been looking in Halfords.

Thanks as always.

 

[Eclipse]

Don't buy from halfwits, go to your local motor factors. 2.5mm2 is plenty.