I bought this to replace a pipe, classic metal, for the shower. I took 2 m, the previous was 1.5 m. The length is more comfortable with fewer constraints on the pipe, without this being absolutely essential. Contacting the plastic with the shower cabin is less aggressive than the metal sheath of the previous. There actually has an anti-twist system, once screwed the knob rotates freely on the pipe. In the case of use in bath, I'd recommend 2 m if the tap is ultimately bath, 1.5 m if the valve is in the middle because unlike the shower hose will hinder taking up much space in the background. In conclusion, I am satisfied with my purchase, I advise shower a minimum of one meter fifty but more comfort if longer, for bath as described above.