Hi Dave,
Thanks for your reply and recommendation. I think I have tried Pelican Parts but I will try again just to be sure. My external pump is knackered and I do have a new one but I don't want to fit it until I know what the other parts do in case they need replacing as well. I think you are right about the Absorber and it makes sense even if we don't understand their terminology. In 1986 I had a V8 Rover Vitesse but loved the cossies too!!!