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Peterson Fluid Systems replacement filler cap O‑ring for billet filler necks. It provides a serviceable seal for Peterson lightweight oil tanks, keeping the filler cap seated and helping prevent leaks in dry‑sump and race tank setups. Made as a direct replacement o‑ring, it’s intended for use with Peterson lightweight oil tanks and filler caps where a reliable seal is required.
Peterson Fluid Systems O-Ring Billet Filler Cap/Neck
