[griff]

I'm replacing my tub/shower faucet and valves. Trying to anyway. In order to get the valve off (single handle, cross piece), I need to remove the couplers from the water supply lines. These are very difficult to turn (using a medium sized pipe wrench), in fact the couplers don't turn at all, I end up twisting the connecting pipes. I've added Liquid Wrench with no success. Any other products or tools? I guess the next step would be cutting them off – I'd probably let a pro do that. Just wondering if I've exhausted my options.