pipe wrench works fine, what I did was: use an impact wrench to tighten up the nut on the bottom, then I backed it off, one of them came out with no problem, the other took a pipe wrench. I suggest using that pb spray stuff, it is a really strong penetrating lubricant, it is like $3-4 at wal-mart, let it soke for a couple minits, then wrench it out, just don't torque on it to hard, if it doesn't start to budge, then try the double nutting I deah. n good luck.