Sealey Premier AK8531 Water Pump Pliers 250mm Self Adjusting. These self-adjusting water pump pliers from Sealey have an innovative design which allows the jaws to automatically adjust to any size enabling one handed operation. Made from drop-forged chrome vanadium steel with vinyl dipped handles. Hardened jaws for extra strength and shock absorber spring for extra grip. Length 250mm. Maximum jaw capacity 50mm. Manufacturer's part AK8531.