Holley Secondary Accelerator Pump Diaphragm Spring Kits YA0601 features (3) 3/8"-16 accessory threads

features (3) 3/8"-16 accessory threads and weighs just one pound

Type R polyurethane sole with posi-grip pattern

188 in Cap OD

Auto Enforcer Shark

Holley Secondary Accelerator Pump Diaphragm Spring Kits YA0601 features (3) 3/8"-16 accessory threadsSecondary Throttle Operating Ranges Color: White Relative Load: Lightest Color: Yellow Relative Load: Lighter Color: Purple Relative Load: Medium Light Color: Plain Relative Load: Medium Color: Brown Relative Load: Heavy Color: Black Relative Load: HeavyHolley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every NASCAR Cup team and nearly every NHRA Pro Stock champion for four decades. Now, Holley EFI