Glow-worm combi boiler 100e information urgently needed?

its a brass round flat valve with machine screws holding it together, with 2 thin pipes comming off it.
to fix you will have to shut off the flow and return valves and the cold supply to the boiler, drain the pressure ( with PRV is quick) undo valve assemble and change diaphram. quite easy but id google for a service manual to study before you attempt

col
October 2007

if you need to ask such a basic question are you really up to doing the job yourself????

Paul the gas man
October 2007