Which Jetter Nozzle Fits My Machine? Sizing by Brand & Model (Mongoose, US Jetting, Spartan, HotJet & More)

Start with the machine, not the nozzle

Every week someone calls and asks, "Which nozzle should I buy for my Mongoose?" It's the right instinct but the wrong first question. A jetter nozzle doesn't care what name is stamped on your machine. It cares about three numbers: your flow (GPM), your pressure (PSI), and the hose size those numbers travel through. Get those three right and the nozzle almost picks itself.

The reason plumbers search by brand is simple — you know your machine's name, not always its numbers. So we're going to do both. Below we'll turn common machine models into GPM, PSI and hose size, then match those to the correct nozzle size class and the right jet configuration for the job in front of you. By the end you'll be able to size a nozzle for almost any rig, whether it's on this list or not.

The three numbers that actually matter

1. GPM (gallons per minute) — this is the muscle

Flow is what moves debris. If pressure is the knife, flow is the shove that carries the mess down the pipe and out. GPM is the single most important number when matching a nozzle, because the nozzle's internal jets (the inserts) have to be sized to pass your machine's exact flow at the pressure you run. Too much jet area and you bleed off pressure. Too little and you starve the pump or spike your PSI past the hose rating.

2. PSI (pounds per square inch) — this is the bite

Pressure gives the jets their cutting and scouring bite. Most drain and sewer work lives between 1,500 and 4,000 PSI. Higher isn't automatically better — a controlled 2,500 PSI at good flow clears more grease than a screaming 4,000 PSI at a trickle. Pressure and flow are a balance, and the nozzle is where that balance gets set.

3. Hose size — this is the ceiling

Your hose ID caps how much flow you can realistically push and sets the thread on the nozzle. It's the fastest way to get in the right ballpark. Here's the canon flow range by hose size:

Hose ID	Typical flow range (GPM)	Where you'll see it
1/4"	4–8 GPM	Cart & portable jetters, sink/lateral work
3/8"	5–12 GPM	Most trailer & skid mid-range machines
1/2"	12–24 GPM	Heavy trailer jetters, mainline work
3/4"	18–40 GPM	Large municipal-class machines
1"	30–80 GPM	Big municipal / industrial jetters

If you only know one thing about your setup, know your hose size — it narrows the whole decision fast. If you'd like the full breakdown of how hose ID changes everything downstream, read our companion guide: The Complete Guide to Jetter Hose Sizes: 1/4" vs 3/8" vs 1/2".

Where to find your numbers

Before you match anything, confirm your machine's rated GPM and PSI. Check, in this order:

• The data plate on the machine or pump.
• The operator's manual (often lists max GPM at max PSI).
• The spec sheet on the manufacturer's site by model number.

Run the nozzle to your machine's rated working numbers, not the pump's theoretical peak. A machine badged "4000 PSI" often does its real work at 2,500–3,000 PSI with the flow it actually delivers. That working flow is what we jet the inserts to.

Machine-to-nozzle sizing by brand & model

Here are common machines mapped to hose size and the nozzle size class that fits them. These are verified machine specs; where your exact model differs, trust your own data plate over any chart.

Machine	Approx. flow / pressure	Hose size	Nozzle class
Mongoose 184	≈ 18 GPM @ 4000 PSI	1/2"	1/2" nozzles
US Jetting 4018	≈ 18 GPM @ 4000 PSI	1/2"	1/2" nozzles
BossJet MAX	≈ 18 GPM @ 4000 PSI	1/2"	1/2" nozzles
HotJet II	12 GPM @ 4000 PSI	1/2"	1/2" nozzles
Spartan Warrior class	≈ 12 GPM @ 3000 PSI	1/2"	1/2" nozzles
Warthog WT 3/8"	5–12 GPM	3/8"	3/8" nozzles
Warthog WT 1/2"	9–21 GPM	1/2"	1/2" nozzles
Typical cart / portable jetter	4–12 GPM	1/4" or 3/8"	1/4" or 3/8" nozzles

Notice a pattern: a lot of serious trailer machines land in the 12–18 GPM range on 1/2" hose, which is exactly why 1/2" nozzles are the workhorse of the industry. Smaller carts and portables live in 1/4"–3/8" territory for sink lines and laterals. Don't own one of these exact models? Fall back to the hose-size table above and confirm with your GPM. That's the whole trick.

Shop by the class you landed on

• 1/2" jetter nozzles — for 12–24 GPM trailer/skid machines (Mongoose, US Jetting, BossJet, HotJet II, Spartan Warrior, Warthog WT 1/2").
• 3/8" jetter nozzles — for 5–12 GPM mid-range machines (Warthog WT 3/8", many cart jetters).
• 1/4" jetter nozzles — for 4–8 GPM portables, sink lines and tight laterals.

Now match the nozzle to the JOB

Once the size class is set, jet configuration decides how well it clears the specific mess. Same size, different job, different nozzle:

Grease & soft blockages (restaurants, kitchen lines)

You want strong rear jets to emulsify and flush grease, plus enough flow to carry it out. Grease is a flow job more than a pressure job — don't starve it.

Roots & tougher intrusions

You want penetration to break in and aggressive rear thrust to pull debris back. A penetrating front jet gets you through the plug; rear jets do the cleanup.

Mainline scouring & long runs

Rotary and multi-jet designs give you 360° wall contact to scour the full pipe circumference — ideal for sand, sludge and general buildup over distance.

Sand, silt & general debris

A balanced rear-jet nozzle with good self-propulsion pulls hose down the line and evacuates settled material efficiently.

Why "jetted to your machine" is the part that matters

Here's the piece most buyers miss. Two 1/2" nozzles can look identical and perform completely differently, because the inserts — the tiny precision jets threaded into the nozzle body — determine how flow and pressure come out. At JetterProSupply, nozzles are jetted to your machine's exact GPM before they ship, so the flow-to-pressure balance is dialed in for your rig, not a generic average.

That also means you're not locked in forever. Our nozzles use a replaceable insert design — change the inserts, not the whole nozzle. Buy a bigger machine next year, or need to re-tune for a different job, and you swap inserts instead of buying new hardware. Inserts ship same day, and they carry a 3-year steel / 5-year ceramic warranty free. Worn jets are the number-one reason a good nozzle stops cutting; being able to refresh them in a day keeps you working.

Our nozzles are Germany-engineered and assembled in America in Spartanburg, SC — engineered and manufactured by KEG Technologies. Built right, jetted to your flow, they pass through on the first try. Cheaper nozzles often take three or four passes to do the same job, and that time adds up over a route.

Quick decision recap

• Step 1: Find your GPM, PSI and hose size from the data plate or manual.
• Step 2: Use the hose-size table to land on a nozzle class (1/4", 3/8", 1/2" and up).
• Step 3: Pick the jet configuration for your job — grease, roots, mainline, or general debris.
• Step 4: Have it jetted to your machine's exact GPM so pressure and flow are balanced.

Common sizing mistakes to avoid

Even experienced techs get tripped up by a few recurring errors. Watch for these:

• Buying by pump peak instead of working flow. A pump rated at a headline PSI rarely delivers that pressure and its full flow at the same time. Size the nozzle to the GPM your machine actually pushes at your working pressure.
• Ignoring hose length and elevation losses. Long hose runs and vertical lifts bleed off pressure by the time water reaches the nozzle. If you routinely run long lines, factor that in rather than sizing to the numbers at the pump.
• Oversizing the jets for the machine. Too much total jet area drops your working pressure and kills cutting bite. It's the most common reason a "powerful" machine underperforms — the nozzle is bleeding it off.
• Undersizing the jets. Too little jet area starves the pump or spikes pressure past your hose rating. Neither is good for the equipment or the operator.
• Running one nozzle for every job. A grease nozzle and a root nozzle in the same size class behave very differently. Match the jet configuration to the mess in front of you, not just the pipe.

The through-line on all five: a nozzle jetted to your machine's real, working GPM avoids nearly every one of these. That's precisely why we jet inserts to your flow before shipping instead of handing you a generic average.

Quick answers to the questions we get most

Can one nozzle work across two machines?

If both machines share the same hose size and run similar GPM, often yes — and if the flows differ, you re-jet the inserts rather than buying a second nozzle. That's the advantage of a replaceable-insert design.

Do I need a different nozzle for hot-water jetting?

The sizing logic is identical — match GPM, PSI and hose size. Heat helps with grease specifically, but it doesn't change which nozzle class fits your machine.

My machine isn't on your table — now what?

Fall back to hose size. Confirm your GPM from the data plate, drop it into the hose-size range table, and you'll land in the right class every time. Then match the job.

Not sure? We'll size it with you

If your machine isn't on the list, or you run mixed jobs and want one nozzle that covers most of them, use our interactive Nozzle Finder — plug in your GPM, PSI and hose size and it walks you to the right class and configuration. Prefer to talk it through with someone who runs these tools? Call (864) 804-6637 and we'll size it with you over the phone. Orders over $199 ship free, 2–3 day shipping site-wide, and replacement inserts go out same day.

Match the numbers, match the job, jet it to your machine. That's how you buy a nozzle once and clear the line on the first pass.

Jumping to bigger pipe? Match flow for 6-inch and 8-inch mainlines.