But if its worked ok since 1970 and no mucky hot water, and provided 1 way valve keeps going in the cylinder. And the people are my best friends. And if I print out our chat. Then if it works ok we will all know that in the future the pump needs refiting on the other pipe pulling instead of pushing. In the mean time will it work. Oh and is the injector tee a tee or a fancy posh type of tee ? And thanks for your help, glad your nocturnal.