water pump

im working on my water pump well i want to get this shit fixed. im following this tut http://forums.nicoclub.com/zerothread?id=220947 to help me out. but i cant get the coupling off… dont have a long enough 10mm to break it loose. im iin oakville 6th and dundas and i have trees. any wanna reach with a 10mm quicktime. burn in return.