SLUDGE-PAK® hydraulic packing sets are designed to reduce the friction and abrasion often associated with vertical sludge pumps. In the bottom of the stuffing box is Style 8921-K. Next is Style 432 CHEVRON® sealing rings. Topping off the set is a Style 9220 GARTHANE® (urethane) U-seal. This unique packing arrangement decreases the chance of scoring plungers, providing unbeatable performance in today’s waste treatment industry.