Grohe Shower Valve Port Closer
I've got a Grohe 34 331 shower rough-in valve which has 4 ports - 2 in and 2 going out. I want to use it as a shower only device and need to close the one of the two exiting ports. The instructions say that Grohe sells a part to do this but I can't find it anywhere. Am I correct in thinking I can just stick a closed piece of pipe on the port and done with it?