InSinkErator Pro 333 Contractor – 3/4 HP Power for Serious Everyday Use
The InSinkErator Pro 333 Contractor (Contractor 333) has been a quiet workhorse for a lot of busy kitchens – including here on InSinkEratorReviews.com, where it’s historically been one of our top-converting units. With a 3/4 HP motor, stainless steel grind components, and a compact black design, it’s built for homeowners and light commercial users who want more power and durability than a basic builder-grade disposer.
If you’re still deciding which series is right for you, start with our Garbage Disposal Buying Guide for a full overview of horsepower, noise levels and installation options, then come back here to see if the Pro 333 fits your kitchen.
Quick specs: InSinkErator Pro 333 Contractor
| Horsepower | 3/4 HP Dura-Drive® induction motor |
|---|---|
| Feed type | Continuous feed |
| Grind components | Stainless steel grind components |
| Chamber / body | Durable construction in compact black housing |
| Mount system | Standard InSinkErator 3-bolt assembly |
| Typical household size | 3–6 people, heavier everyday use |
| Warranty | Approx. 3-year limited in-home warranty (varies by region) |
Who the Contractor 333 is best for
The Pro 333 Contractor sits in a sweet spot between cheap builder-grade disposals and ultra-premium Evolution models. It’s a strong choice if:
- You cook regularly and push a steady stream of scraps through your disposer.
- You want more power than 1/2 HP units like Badger 5, without going all the way up to a 1 HP beast.
- You care about durability and like the idea of stainless steel grind components.
- You’re replacing an older contractor-grade or Pro Series disposer and want a solid modern equivalent.
- You’re a landlord or light commercial user who wants a reliable “fit-and-forget” workhorse.
If your top priorities are ultra-quiet operation and fancy sound insulation, you may want to compare this unit with the premium models in our Evolution Series Mini Guide.
Power and grinding performance
3/4 HP Dura-Drive® motor
At 3/4 HP, the Pro 333 delivers a noticeable step up from 1/2 HP models when it comes to grinding tougher scraps. It’s more forgiving if you occasionally send through harder items, and it keeps up better with heavy meal prep in busy households.
Stainless steel grind components 
One of the big advantages over budget disposers is the use of stainless steel grind components. Compared to galvanized steel, stainless holds up better over time in a wet, high-impact environment. That means:
- Less risk of corrosion and pitting.
- More consistent performance as the unit ages.
- A generally longer service life when used correctly.
Everyday food handling
Used properly, the Contractor 333 handles the usual suspects very well:
- Vegetable scraps and peels.
- Cooked meat and small bones in moderation.
- Leftover rice, pasta and soft foods (flushed with plenty of water).
- Fruit scraps, small cores and rinds (avoid large, stringy loads).
As always, avoid dumping large volumes of fibrous waste, egg shells, coffee grounds or fat/grease down any disposer – even a more powerful one like this. That’s more about drain health than horsepower.
Noise and day-to-day use
The Pro 333 is not part of InSinkErator’s super-quiet Evolution “SoundSeal” line, but many users find it noticeably smoother and more refined than entry-level units. Expect:
- A solid, confident hum rather than a harsh rattling sound (assuming proper installation).
- Shorter grind times thanks to the 3/4 HP motor, which means noise doesn’t last as long.
- Normal vibration levels for a disposer of this size when mounted correctly.
If you have an open-plan kitchen and are extremely noise-sensitive, premium Evolution models will still win for quietness – but the Contractor 333 is a strong middle ground between price and performance.
Installation and compatibility
Standard 3-bolt mount
The Pro 333 uses InSinkErator’s familiar 3-bolt mount. If you already have an InSinkErator unit installed, there’s a good chance you can reuse the existing sink flange and mounting hardware if it’s in good condition. That can dramatically reduce install time.
Power connection
The exact configuration can vary, but you’ll typically see the Pro 333 set up for either:
- Hard-wired connection to a switched circuit, or
- Use with a compatible power cord kit and switched outlet under the sink.
If you’re not comfortable with electrical work, a licensed electrician can handle the wiring or outlet side for you. For more detail on plug-in setups, see our Power Cord Kit Micro-Guide.
Dishwasher connection and accessories
Like most modern disposers, the Pro 333 can be connected to a dishwasher drain line when installed correctly. If you need help with that setup, our Dishwasher Connector Kit Guide walks through the basics and accessory options.
You can also upgrade the splash guard with a quieter, more flexible baffle – check out our Sink Baffle & Stopper Guide for ideas.
Durability, warranty and real-world reliability
With stainless steel grind components and a robust 3/4 HP motor, the Contractor 333 is designed to put up with years of regular use. When paired with sensible habits (cold water, no grease, avoiding long strings of fibrous material), many units run reliably for a long time.
In many regions it ships with around a 3-year limited in-home warranty, where a technician can come to you if something fails under warranty. Always check the exact warranty terms for your region, as coverage can vary.
Pros and cons of the InSinkErator Pro 333 Contractor
Pros
- 3/4 HP motor gives you more power and faster grinding than 1/2 HP models.
- Stainless steel grind components for better long-term durability.
- Standard 3-bolt mount means easier replacements in many existing InSinkErator setups.
- Compact black design that looks great in modern under-sink layouts.
- Well-suited to busy households and light commercial environments.
Cons
- Not as quiet as fully sound-insulated Evolution Series disposers.
- Overkill for very small households with light use – a 1/2 HP unit may be more cost-effective.
- Requires correct wiring or outlet setup; some installs will need an electrician.
Pro 333 vs other popular InSinkErator models
| Model | Horsepower | Grind components | Noise level | Best for |
|---|---|---|---|---|
| Badger 5 | 1/2 HP | Galvanized steel | Standard | Smaller households, budget installs |
| Pro 333 Contractor | 3/4 HP | Stainless steel | Moderate (more refined than entry-level) | Busy families, light commercial use |
| Evolution Cover Control | 3/4 HP | Stainless steel | Quieter (SoundSeal® technology) | Open-plan kitchens, noise-sensitive users |
For a deeper look at how the premium models stack up, see our Evolution Series Mini Guide.
Where to buy the InSinkErator Pro 333 Contractor
The Pro 333 Contractor is commonly available through plumbing suppliers, home improvement stores and online retailers. Amazon often lists competitive pricing and fast shipping within the U.S.
What real owners are saying about the Contractor 333
Across Amazon, the InSinkErator Pro 333 Contractor holds an average rating of around 4.6 out of 5 stars, with the majority of buyers giving it a full 5-star score. When you read through the recent reviews, a few clear themes keep coming up.
👍 Consistently easy to install
Many reviewers mention swapping out an older InSinkErator for the Contractor 333 in under an hour. The familiar 3-bolt mount and matching height make it a straightforward replacement job for a lot of DIY homeowners, especially when they’re replacing the same model.
🔊 Quiet, smooth operation
While it’s not marketed as an ultra-quiet Evolution model, a lot of owners comment that the Contractor 333 is quieter and smoother than their previous disposer. Several reviewers highlight that it runs “nice and quiet” once installed correctly and that the sound is very manageable in everyday use.
💪 Long-term reliability
A recurring pattern in the reviews is people replacing a Contractor or Pro 333 unit that lasted well over a decade – sometimes close to 20–25 years. That repeat-purchase behaviour says a lot about how happy they were with the performance and lifespan of the original disposer.
🔌 Important: power cord and EZ Connect
One of the most useful bits of feedback is that the power cord is not included in the box. Newer versions often ship with an EZ Connect style terminal intended for hardwired installations, so you may need to buy a compatible EZ Connect cord or have an electrician complete the wiring. Several reviewers were very happy with the unit overall but wished the cord situation was clearer up front.
💵 Overall value
Taken together, most customers feel the Contractor 333 offers excellent replacement value: it drops into the space of their old unit, runs more quietly, and restores their kitchen to normal with very little fuss. For homeowners upgrading from a tired disposer rather than doing a full remodel, that combination of power, reliability and price is a big part of why this model keeps getting recommended.
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Frequently Asked Questions
Is the InSinkErator Pro 333 Contractor suitable for home kitchens?
Yes. While it carries a “Contractor” label and is popular with installers, the Pro 333 is an excellent choice for busy home kitchens that want more power and durability than entry-level disposers.
How quiet is the Contractor 333 compared to other models?
The Pro 333 is generally quieter and smoother than basic 1/2 HP units, thanks to the more powerful motor and build quality, but it does not have the full sound insulation found in Evolution series models. If you want the quietest possible operation, consider stepping up to an Evolution Compact or similar.
Can the Pro 333 be used with a septic system?
Many households do use garbage disposals with septic systems, but you should always follow local regulations and manufacturer guidance. Use the disposer sensibly, avoid grease and excessive solids, and talk to your septic professional if you’re unsure.
What size household is the Pro 333 best suited for?
The 3/4 HP motor makes the Contractor 333 a strong fit for medium to large households (around 3–6 people) who cook regularly and want some performance headroom. Smaller households with very light use may be fine with a 1/2 HP model.
