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The Moroso accelerator pump diaphragm for Holley carburetors is specified at 50cc capacity to match higher-volume pump requirements. Offered as a direct replacement diaphragm for compatible Holley pump assemblies, this 50cc unit is intended for situations where increased pump volume is appropriate during carburetor rebuild or tuning tasks.
Moroso Accelerator Pump Diaphragm - Holley - 50cc
