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Seals wear out overtime and start leaking. Rebuild the seal kit to improve your psi.
Consider replacing the check valves also. Enough seals to repair 3 cylinders.
Details:
FITS AAA Pumps:
8.7GA12
9.6GA12
530001
530002
530008
530009
530016
530028
530030
90030
90037
53BRD23
53BRD25