Do electrofusion joints swivel in the same way that plastic push fit fittings do, or are they fixed, like soldered joints are? I have a water pipe that has an electrofusion elbow joint on it and want to rotate the joint 180 degrees so the pipe lays the other direction. I've not fully dug the pipe out yet so can't tell if it will swivel or will need cutting out and replacing with a philmac joint.