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This Fuelab diaphragm and O‑ring kit fits 535xx and 545xx series regulators and is labeled for all models in those families. Provided as a service kit, it includes the diaphragm and sealing O‑rings required to renew regulator sealing and diaphragm function, supporting maintenance or rebuild tasks on compatible 535xx/545xx regulator units without needing additional parts beyond what the kit supplies.
Fuelab Diaphragm & O-Ring Kit for 535xx/545xx Series Regulators - All Models
