Strap wrenches usually arent good for much. It may work dont get me wrong but it wont supply much torque.
Chances are your staring Red loc-tite right in the face. A good method to loosen loctite is to apply heat. Now if you have NO orings anywheres on the peice in qeustion go ahead and use a flame of some sort to heat the loctite...lighter, stove top, torch, ect. You wont ruin the anno as long as you dont apply to much heat.
Another very good option would be to boil the piece in water, clamp it then wrench the fitting off.
If you have access to a vice and some leather or rubber tubing you'll be in business.
"I wish simply to be a decent person, yet I will always fear the retards" -Brian Hindt(geech) MCB Moderator Kidney Machine