AR WATER SEALS/PACKING KIT CONTAINS HIGH PRESSURE AND LOW PRESSURE SEALS (PACKING) TO SERVICE 3 CYLINDERS ON YOUR AR PRESSURE WASHER PUMP AR2520 Seal Repair Kit from Annovi Reverberi. One of the most common kits for repair leaks and drips on the XT series of pressure washer pumps from Annovi Reverberi. This AR2520 used to be known as the popular AR 1866 so if your looking for that kit this is the one to purchase. This kit is made to repair the XT, XTA and the XTV pumps as well as others that have a 15mm seal dimensions. * This is the replacement repair kit for the old 15mm repair kit which was numbered AR1866. If your manual says to use kit AR1866 you need to order this AR2520 kit instead.