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This Fuelab diaphragm and O‑ring kit is made for 515xx and 525xx series regulators with the standard seat configuration. Packaged as a replacement service kit, it supplies the diaphragm and sealing O‑rings needed for routine regulator maintenance or repair. The kit restores sealing surfaces and diaphragm function on compatible 515xx/525xx regulator models without requiring additional parts beyond what is listed.
Fuelab Diaphragm & O-Ring Kit for 515xx/525xx Series Regulators - Standard Seat
