This Holley accelerator pump discharge nozzle set includes two aluminum, tube-type nozzles with a 0.042 in. hole size, complete with four gaskets and two nozzle screws for rebuilding or recalibrating a Holley carburetor's accelerator pump circuit.
Specifications:
- Material: Aluminum
- Nozzle Size: 0.042 in.
- Nozzle Style: Tube Type
- Includes: 2 nozzles, 4 gaskets, 2 nozzle screws
- Part Number: 121-42
Nozzle sizes .040 in. and larger, like this one, include a hollow nozzle screw.
FAQ
What hole size is this discharge nozzle?
It has a 0.042 in. hole size.
What's included in this kit?
Two tube-type nozzles, four gaskets, and two nozzle screws.
Is this a tube-type or straight-type nozzle?
This is a tube-type discharge nozzle.
Why does this size include a hollow nozzle screw?
Nozzle sizes .040 in. and larger include a hollow nozzle screw, so this 0.042 in. nozzle ships with two.

