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Chris R Thanks for the prompt reply, sorry about the caps, new here. The iso valves you describe are what I was looking for, all I see are what appear to be brass (?) grub screws with very shallow screwdriver slots, already much worn from previous screwdrivers. What I don't understand is...

FEROLI HAWK II COMBI BOILER I NEED TO CHANGE THE TEMP SENSOR IN THE CH PIPE - NOT SURE HOW. I SUPPOSE I NEED TO ISOLATE CH FLOW AND RETURN PIPES. THE BOOKLET REFERS TO FLOW AND RETURN COCKS BEHIND JIG BRACKET. I CAN LOCATE BRONZE (?) ELBOWS WHICH HAVE A SCREW HEAD ON EITHER SIDE OF ELBOW...