Vintage Air heater defroster compact model. Problem is vacum controls I used cale controled coolant valve needed vacume to operate heater door to make defroster work.could hav eused elbowsto make change in direction upwards to the defroster ducts
iIepoxied in the unused channel on primary side,it wasn't drilled though but leaked vacume outside the manifold flange perimiter. the vacume nipple is functunal and notice the power valve blow out protection
this is a Quick Fuel Technology adjustable vacume secondary housing with a quick change spring cover added notice the needle screw ? it can change the opening rate