O-Ring, Y-Motion Nozzle Plate Seal, Hollow, Dr. Oligo Plate 384/768 XL. This O-ring is installed on the top of the large nozzle plate. It should have vacuum grease applied during installation. There are 2 each different O-rings used on the Y-motion seal. This is the larger of the two O-rings. This is the O-ring for systems with no space on either side of the center nozzle plate. This design is the original and was in use until Oct of 2017
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