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This Fuelab diaphragm and O‑ring kit is intended for 515xx and 525xx series regulators that use the large seat configuration. Supplied as a replacement service kit, it contains the diaphragm and O‑rings specific to the large seat variant to support proper sealing and regulator operation during maintenance or overhaul of compatible 515xx/525xx regulators.
Fuelab Diaphragm & O-Ring Kit for 515xx/525xx Series Regulators - Large Seat
