Hi, I have a shower tower fitted and my flexi pipes (500mm) are about 7cm short of where they need to be to fit onto the mixing valve in the back of the shower. I cannot move the shower up and the next longest flexi pipe I can find is 900mm, which is about 830mm longer than I need.. Would a 15mm straight coupler and a shorter flexi pipe connected to the 500mm flexi pipe be better, or would the 900mm one be the answer? Any help would be most appreciated. I have posted pictures to try to show what i mean. Kind regards, Kev.