The invention proposes a feed pipe coupling for a pressurised fluid system, characterised in that the branch of the spring clip which includes the locking portion is configured generally as a hairpin having a radially internal, locking, first branch portion of which the locking portion is a part, together with a radially external, connecting, second branch portion which is connected at each of its ends, firstly to the operational locking branch portion through a bent connecting portion, and, secondly to the central connecting branch of the spring clip, in such a way as to give the locking branch a capacity for elastic deformation in the general transverse plane of the spring clip.