Hello again (on this subject) I'm not able to solve the leak in the 1/2" bsp fitting. (15mm x 1/2" ) chrome elbow. I think the hard red fibre washer can't 'mate' with the nylon cistern inlet. So I bought a pack some leather washers and some nylon washers from B&Q to try. Is a leather washer viable? The nylon ones have a round cross section but appear to be hard also.
Arthur