The best accelerator pump discharge nozzle depends on the carburetor, nozzle style, and orifice size needed for tuning. For several size options, the HENKYO brass set and AegisAutos zinc kit offer four sizes in one package. For a single replacement, Holley’s 121-135 and 121-35 are options from the original parts brand. AED’s two-piece squirter tube set is a separate choice for shoppers looking for tube-style parts. Confirm the part number and nozzle design your carburetor requires before ordering.
| Product | Best For | Notable Detail |
|---|---|---|
| HENKYO 4-Piece Brass Set | Comparing four listed orifice sizes | Brass; 0.031–0.037 inches |
| Holley 121-135 | A single Holley-branded nozzle | Straight-style pump |
| AegisAutos Zinc Kit | Multiple nozzle sizes and pairs | Four pairs; stated carburetor series |
| Holley 121-35 | A Holley replacement part | Genuine Holley quality part |
| AED 5535 Tube Set | A two-piece squirter tube set | Set of two |
HENKYO 4-Piece Brass Nozzle Set
This set includes one nozzle each in 0.031-, 0.033-, 0.035-, and 0.037-inch sizes, along with a copper gasket. The listed features describe brass construction, corrosion resistance, and CNC-lathe processing. The product name identifies it for Holley 4150, 4160, and 4500 carburetors.
Best for: Buyers who want several listed orifice sizes available for carburetor tuning rather than purchasing one size at a time. It was selected because its size range and included gasket are clearly specified.
Limitation: The package contains one of each size, not multiple nozzles of a single size. Verify the required size and fit before replacing a nozzle.
Holley 121-135 Discharge Nozzle
The Holley 121-135 is listed as a straight-style pump nozzle and a genuine Holley quality part. Its product information also notes a limited warranty. This is a focused replacement option for shoppers who have identified 121-135 as the part number they need.
Best for: Buyers seeking a single Holley-branded nozzle, especially when the existing part or carburetor service information calls for 121-135. It is easier to narrow down than a multi-size kit when the required part number is already known.
Limitation: The provided listing details do not state the orifice diameter or include multiple sizes. Confirm those details against your carburetor requirements before ordering.
AegisAutos Zinc Nozzle Kit
This kit includes four pairs of straight-type discharge nozzles in 0.031-, 0.033-, 0.035-, and 0.037-inch orifice sizes. The listing states compatibility with Holley 2300, 4150, 4160, and 4500 series performance carburetors and lists replacement numbers 121-131, 121-133, 121-135, and 121-137. It describes the design as direct-fit with standard dimensions and threading.
Best for: Buyers who want multiple pairs and a stated range of carburetor series and replacement part numbers. The size variety can support comparing options during tuning.
Limitation: The listed material is zinc, not brass. Confirm that the material, nozzle style, and fit are appropriate for your application.
Holley 121-35 Nozzle
The Holley 121-35 is listed as a genuine Holley quality part. Its product information does not provide an orifice measurement, nozzle material, or additional fitment details, so matching the part number is particularly important.
Best for: A buyer replacing a nozzle with the specific 121-35 designation. It was selected as a straightforward single-part option from Holley’s lineup.
Limitation: The provided features are brief and do not establish carburetor compatibility or nozzle dimensions. Check the exact part number and application before purchase.
AED 5535 Squirter Tube Set
AED’s 5535 product is identified as an accelerator pump squirter tube set of two. The supplied product details also list package dimensions and weight, but do not specify an orifice size, material, or carburetor fitment.
Best for: Buyers specifically looking for a two-piece squirter tube set rather than a kit organized by several stated orifice sizes. It adds a tube-style option to this comparison.
Limitation: The available information is limited. Verify the tube’s dimensions and application before choosing it as a replacement.
Buying Guide: How to Choose an Accelerator Pump Discharge Nozzle
Which orifice size should you choose?
Start with the size specified for your carburetor setup or the size of the nozzle being replaced. The listed multi-size kits cover 0.031, 0.033, 0.035, and 0.037 inches. These options make it possible to compare sizes, but the product listings do not establish which size is correct for every engine. Avoid choosing a size based only on appearance or package variety.
Should you buy a single nozzle or a kit?
Choose a single-part listing when you know the exact Holley part number required. A multi-size kit may be more practical when you need several sizes for tuning or want spares. Compare package quantities carefully: the HENKYO set lists one nozzle per size, while the AegisAutos kit lists four pairs.
How important are fitment and nozzle style?
Check the carburetor series, replacement number, threading, and nozzle style before ordering. AegisAutos lists compatibility with Holley 2300, 4150, 4160, and 4500 series carburetors. Holley 121-135 is described as straight style. Do not assume that another part fits solely because it is also called an accelerator pump nozzle.
Does material matter?
The HENKYO set is described as brass, while the AegisAutos kit is identified as zinc. The other listed products do not provide material details in the supplied information. Compare materials only where the listing states them, and follow the requirements for your carburetor and replacement application.
Frequently Asked Questions
What does an accelerator pump discharge nozzle do?
It is a carburetor component associated with the accelerator pump’s fuel discharge during acceleration. The nozzle’s orifice size and fit are important considerations when selecting a replacement.
Are 0.031- and 0.037-inch nozzles interchangeable?
They have different listed orifice sizes, so do not treat them as interchangeable without confirming the correct size for the carburetor setup.
What is the difference between the two multi-size kits?
HENKYO lists four brass nozzles, one in each size, and a copper gasket. AegisAutos lists four pairs of zinc nozzles and states fitment for several Holley carburetor series.
Can I choose a nozzle by part number alone?
A known part number is useful, but also confirm the carburetor application and required dimensions. Some product details do not specify fitment or orifice size.
Are tube-style squirters the same as straight nozzles?
The listings distinguish AED squirter tubes from straight-style discharge nozzles. Check the required component style rather than assuming the designs are interchangeable.