Not especially vital but never seem to see them anywhere.
Toilet handles where this bit...

Is sort stepped or S shaped. See them in some cisterns and ones like above won't fit, usually the cistern is small and the syphon is too near the handle. I usually end up cutting part of one of the above off but looks a bit bodged. They might have a special name which is why I can't find them
Also flexi monobloc tap connectors that end in a half inch bsp connection. When tap tails come with taps they always end with those connections and yet the only ones you can buy end in compression or push fit.
Toilet handles where this bit...

Is sort stepped or S shaped. See them in some cisterns and ones like above won't fit, usually the cistern is small and the syphon is too near the handle. I usually end up cutting part of one of the above off but looks a bit bodged. They might have a special name which is why I can't find them
Also flexi monobloc tap connectors that end in a half inch bsp connection. When tap tails come with taps they always end with those connections and yet the only ones you can buy end in compression or push fit.