Extend The Life of Your Tap. The performance of any tap is directly related to the condition of the tap seat. If the tap seat is badly worn, scored or out of square then no matter how good the tap valve is, the tap may still drip persistently. By using the HydroSeal Tap Seat Refacing Tool, with its uniquely designed cutter that won’t dig in, your tap seat will be left smooth, flat, and square. The tool is designed to be driven using a cordless drill or variable speed electric drill on a low speed.