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Hi can anyone tell me how much work is involved in changing a expansion vessel on a ariston STYX SX 20 MFFI CE - EURO COMBI? Thanks duckman

hi, i am new to the forum and hope someone can help me. i have a ariston sx 20 mffice eurocombi which is leaking water from the stem of the divertor valve (just beneath the diapham housing and the ports) there are 2 grub screws holding them together so they do come apart. does anyone know what...