A new water main break repair tool for permitting repair of a broken water main without depressurizing the water main. The inventive device includes an elongate shaft with a grasping handle attached to an upper end thereof. First and second clamping assemblies are pivotally connected to a lower end of the shaft for clamping a water main therebetween. A sealing band is attached at one end thereof to the first clamping assembly while the opposite end of the band is attached to the second clamping assembly. The sealing band forms a sealed channel around a break in the water main when the main is clamped between the clamping assemblies. A manually operated actuating assembly is provided for pivoting the clamping assemblies into and out of engagement with the water main, while a locking lever maintains the assemblies in the clamped position around the water main.