The Atwood & Morrill Weir Wiper Ring 257821720000000 is a pack of 4 units designed to provide a secure seal for pump shafts. Made by the reputable brand Atwood & Morrill, these wiper rings are essential components for maintaining the proper functioning of pumps in various industrial and business settings. With a unit quantity of 4, these wiper rings are sure to meet the needs of your hydraulic, pneumatic, or plumbing system.