InSinkErator Pro 333 Contractor Review (2026): 3/4 HP Power for Serious Everyday Use
The InSinkErator Pro 333 (Contractor 333) has been a quiet workhorse for busy kitchens — and on InSinkEratorReviews.com it’s historically been one of our strongest converting “step-up” units. With a 3/4 HP motor, stainless steel grind components, and a compact black design, it’s built for homeowners who want more power and durability than a basic entry-level disposer, without paying premium Evolution prices.
If you’re still deciding which series is right for you, start with our Garbage Disposal Buying Guide for a quick 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 333)
| 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 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 the Badger 5, without going all the way up to 1 HP.
- You care about durability and prefer stainless steel grind components.
- You’re replacing an older contractor-grade / Pro-style disposer and want a solid modern equivalent.
- You want a reliable “fit-and-forget” workhorse for a busy household.
If your top priority is ultra-quiet operation, compare this unit with 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 typically 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. That’s more about drain health than horsepower.
Noise and day-to-day use
The Pro 333 also overlaps closely with newer Power Series models in terms of performance, so if you’re exploring that middle tier, our Power Series overview is a helpful next stop.
The Pro 333 is not part of InSinkErator’s ultra-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 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 want more detail on plug-in setups, see our Power Cord Kit 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.
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. Always check the exact warranty terms for your region, as coverage can vary.
Pros and cons of the InSinkErator Pro 333
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 can make replacements easier in many existing InSinkErator setups.
- Well-suited to busy households and heavier everyday use.
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.
- Some installs may require an electrician depending on your wiring/outlet setup.
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 333) | 3/4 HP | Stainless steel | Moderate (more refined than entry-level) | Busy families, heavier everyday use |
| Evolution Cover Control | 3/4 HP | Stainless steel | Quieter (SoundSeal®) | 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
The Pro 333 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 Pro 333 (Contractor 333)
Across major retailers, the InSinkErator Pro 333 often holds an average rating in the mid-4s out of 5 stars. When you read through recent reviews, a few clear themes keep coming up:
👍 Consistently easy to install
Many reviewers mention swapping out an older InSinkErator in under an hour. The familiar 3-bolt mount and matching height make it a straightforward replacement for many DIY homeowners, especially when replacing a similar unit.
🔊 Quiet, smooth operation (for the price tier)
While it’s not marketed as an ultra-quiet Evolution model, many owners say the Contractor 333 is quieter and smoother than their previous disposer once installed correctly.
💪 Long-term reliability
A recurring pattern is people replacing an older Pro/Contractor unit that lasted many years. That repeat-purchase behaviour says a lot about satisfaction with performance and lifespan.
🔌 Important: power cord and wiring
One of the most useful bits of feedback is that a power cord is often not included. Depending on the version, you may need a compatible cord kit or a hardwired installation. If you’re unsure, confirm your setup before ordering.
Back to top – view price & availability
Frequently Asked Questions
Is the InSinkErator Pro 333 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 smoother and quieter than basic 1/2 HP units, but it does not have the full sound insulation found in Evolution models. If maximum quietness matters, consider a premium Evolution unit.
Can the Pro 333 be used with a septic system?
Some households 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 consult your septic professional if unsure.
What size household is the Pro 333 best suited for?
The 3/4 HP motor makes the Pro 333 a strong fit for medium to large households (around 3–6 people) who cook regularly and want performance headroom compared to 1/2 HP units.
