Robogrips are awesome, but sometimes you need a tool you are willing to destroy, and a pipe wrench will fit the bill. Self Adjusting Wrenches are awesome, but Monkey wrenches have their place.
ROBOGRIP PLIER 7″ Curve jaw 3/4″ capacity Spring loaded Laminated steel Ergonomic handles Red Blister pack. The tool weighs 9.6 ounces. The adjustment is automatic and you get a lot of contact surface. Robogrip last a really long time too. These are an essential!
If you are looking for an adjustable monkey wrench though this one is appropriate. It will do the job. The Ridgid 31010 10-Inch Pipe Wrench is built to last and will turn up to 1-1/2-inch pipes. One of the shorter pipe wrenches available, the Ridgid 10-inch will allow maneuverability with a tough handle. Weighs in at 1 3/4 pounds.