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The new 320-328 series covers up to 385 gpm and 275 ft of head. The pumps feature a slip-fit O-ring/flinger design, which prevents leaks caused by deformation as a result over-tightening. They are mounted on a JM frame and incorporate a back pull-out design and weep holes in the impeller. The weep holes extend seal life by creating fluid movement in the seal cavity which aids in venting of air at start-up.