the casting as two copper pipe
the casting as two copper pipes connected into it with rubber seals should there be a hole connecting the through passage between the pipes and the thermostat ? If so what size should the hole be ? At the moment the casting as no hole but there is a lot of rust so...
"Two copper pipes connect into
"Two copper pipes connect into the casting, should there be a hole in the casting connecting these pipes to thermostat or do they just bypass it?
many thanks John"