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Install a new plunger screw in your General Pumps AB Series (AB90DP, AB100DP, AB120DP, AB180DP) or HTCK4050S pump model. Using General Pumps OEM parts, such as the 71219566 plunger screw, is one of the best ways to extend the life of your pump. Genuine General Pumps replacement part, guaranteed to fit. Use to replace damaged screw during maintenance or repairs.