Hello John. Attached please find the Pac Fab/Pentair Star D.E. (model ST35) exploded parts diagram. The APCK1155 contains the following o-rings as referenced in the exploded parts diagram: part keys 6,9,12,17 (qty2), 18. The standpipe o-ring (part key 35) O-ring is not included in the APCK1155 but is available separately.
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