How do you fit a egr valve to a vauxhall corsa 1999?

first you need to run the engine so it warms up. turn it off then disconnect the pipes(you need to run the engine so its easier to take the pipes off otherwise your gonna struggle) then un do all the bolts, when you take the valve off their is gonna be water pouring out of the engine as it is the engine coolant. when you have took it all off including the gasket give it a good clean so that when put the new one on it will seal properly. then when you have done that put it in place put the bolts back in tighten them up replace pipes and top up your engine coolant and jobs a good un.