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Compact close coupled design using standard NEMA "C" OR "TC" motors. Back pull-out design for easy maintenance. Optional O-ring design available. 316SS - John Crane Type 21 Viton®, Carbon vs. Ceramic, standard seal. John Crane Type 9 Teflon® seal available. Optional seal face materials include Ni resist, tungsten carbide and silicon carbide. Seal flush optional.