Create printer port

Hi. I need help with creating a printer port programmatically in C#.
This is what I have

            ManagementClass portClass = new ManagementClass("Win32_TCPIPPrinterPort");
            ManagementObject portObject = portClass.CreateInstance();

            portObject["Name"] = portName;
            portObject["HostAddress"] = "174.30.164.15";
            portObject["PortNumber"] = portNumber;
            portObject["Protocol"] = 1;
            portObject["SNMPCommunity"] = "public";
            portObject["SNMPEnabled"] = true;
            portObject["SNMPDevIndex"] = 1;

            PutOptions options = new PutOptions();
            options.Type = PutType.UpdateOrCreate;
            portObject.Put(options);

This works fine, but it creates a TCP/IP printer port. I need to create a redirected printer port, a port type which is created by RedMon.
How do I create a port of any specified type? Is it possible to write a method of the form

void CreatePort(string portName,string portType)

which creates a port with the name portName and type portType, assuming that a port type with the name portType exists?