Before I start cutting hoses to install a Perko inline flush kit (for winterizing with antifreeze), does anyone know what size inside diameter my raw water pump for a 1986 Crusader 7.4 454 (closed cooling) engine would use? At the thru hull shutoff valve I can see clearly that it's smaller than other 1 1/2" hoses used elsewhere in the system, so my guess is that it is a 1" ID hose or a 1 1/4" ID hose. The crusader parts manual which I have is of no help. This operation will be done with the boat in the water. Thanks.