I'm looking to replace the main shut-off valve in my home with a ball valve as the existing fitting does not properly shut off the water flow. The existing shut-off valve appears to be a threaded female-female fitting. I've found lots of guides on how to replace a male-male fitting but not this particular application. I've attached a picture for reference. I'm not exactly sure how to start removing this fitting.
Any help is much appreciated!
Any help is much appreciated!