.Hello Mr Brooks
I have sat and thought i should be able to connect the two but as pointed out by Tracy'D'arth the engine side is presuised the Webasto just has a header tank join together and it wud blow out though the header tank,i just looked at it as two hot water systems,the idea of hot water use of both system woud be good to help one another but ,but, oh puff.Oh well at least i;ve learned that manifold blank plugs can blow out ,
Many thanks for the input
Alantw