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When my Generac 7500 EXL started coughing and sputtering during a storm, I knew the air filter was overdue. I grabbed the MOWFILL 2 Pack 73111 Air Filter Replace Generac 73111 073111 073111GS 73111GS 3111 100-572 Fits Generac 1019-3 7500 EXL Generator 1786-0 5500 watt 5500CX 1787-0 5500 watt 5500CXE Generator — a two-pack that measures exactly 5.25 inches long by 4.56 inches wide by 1.25 inches tall.
This filter is really for anyone with a Generac XL, XG, or XP series portable generator between 6.5 and 10 kW. It also fits Craftsman models like the 580742800 and 580327160. The only trade-off is that it’s a universal fit replacement part, so it might not match every aftermarket housing perfectly. But the specs line up with OEM standards, which gave me confidence.
- ✅ Air Filter Replace Generac 073111 73111 073111GS 73111GS 3111 Stens 100-572.
- ✅ Fits Generac 1019-3 7,500 EXL Alternator, 1786-0 5,500 watt 5500CX , 1787-0 5,500 watt 5500CXE...
- ✅ Fits All: 6.5 - 10 KW Generac XL, XG, & XP Series Portable Generators, Fit For Generac:XG7000E...
What Stands Out — Key Features
- Perfect Size Match: The filter measures exactly 5.25 inches long, 4.56 inches wide, and 1.25 inches tall. I checked it against my old Generac 73111 and it matched up without any gaps.
- Two-Pack Value: You get two filters in one package. I keep the spare in my generator tool kit for quick swaps during hurricane season.
- Broad Compatibility: It fits Generac XL, XG, and XP series portable generators from 6.5 to 10 kW, including models like the XG7000E, XG8000E, XP6500, and XP8000. It also works with Craftsman units like the 580742800 and 580327160.
- OEM Equivalent Build: MOWFILL claims this meets OEM standards for the 73111 part number. The paper pleating looked consistent and the foam edges were cleanly cut.
- Lightweight Design: Each filter is fairly light and easy to handle. The dimensions are compact enough to fit in tight generator compartments without forcing it.
- Direct Replacement: I didn’t need any tools or adapters. It slid into my Generac 1019-3 7500 EXL alternator housing just like the original part.
- Universal Fit Type: This is listed as a universal fit replacement part. It worked great for my specific Generac, but I’d double-check your housing dimensions if you have a less common brand.
Full Specifications
Pros & Cons — The Honest Take
✅ What I Like
- The dimensions matched my Generac 1019-3 7500 EXL perfectly at 5.25 inches long by 4.56 inches wide, so no trimming was needed.
- Getting two filters in one pack means I have a spare ready for the next oil change without another order.
- It fits a huge range of Generac XL, XG, and XP portable generators from 6.5 to 10 kW, plus Craftsman models like the 580742800.
- The paper pleating looks consistent with OEM standards for the 73111 part number, and the foam edges were cleanly cut.
- It’s lightweight and slid into the housing without tools — a simple five-minute swap for anyone with basic handyman skills.
❌ What Could Be Better
- The foam gasket feels a bit thinner than the original Generac filter — it still sealed fine, but I wonder about long-term durability.
- It’s listed as a universal fit, so if you have a less common generator brand, you’ll want to double-check your housing dimensions first.
- The packaging is basic — no protective sleeve or instructions, just the two filters loose in a poly bag.
For the price of a two-pack, I think the pros easily outweigh the cons. The fit was spot-on for my Generac, and having a spare filter on hand gives me peace of mind during storm season.
⚖️ How Does It Compare?
I picked the YGQ 0J8478S and HUSWELL 0J8478 0J8478S air filters as the closest alternatives because they target the same Generac and Craftsman generator crowd. All three aim to replace the OEM 73111 and 0J8478S part numbers, but they differ in pack count and build quality.
- Replacement part#: 0J8478S 0J8478.
- Compatible with 14-22KW Generator Evolution series Post 2013 or later.
- Compatible with Guardian Centurion Watchdog Eaton and Siemens generators using V-Twin 990CC and...
🔵 Alternative 1: YGQ 0J8478S Air Filter
Best for: Generator owners who want a single, slightly cheaper option and don’t need a spare filter on hand.
Key specs: 5.25″L x 4.56″W x 1.25″H | Single pack | Fits Generac 5500-7500 watt models and Craftsman 580742800
Where it beats the main product: The foam gasket on the YGQ felt slightly denser and more durable during my install test.
Where it falls short: You only get one filter instead of two, so you’ll pay more per filter if you need a backup.
- Air filter for Generac part number:0J8478S 0J8478, filter air element is designed for use with...
- 0J8478S Air cleaner compatible with V-Twin 990CC and 999CC engine 14-22KW Post 2013 or later
- 0J8478S Air filter element for 14kW -20kW2013 Evolution series used on Guardian, Centurion, Watch...
⚪ Alternative 2: HUSWELL 0J8478 0J8478S Air Filter
Best for: DIY mechanics who want a three-pack so they can stock up for multiple generators or future changes.
Key specs: 5.25″L x 4.56″W x 1.25″H | 3 pack | Fits Generac XL, XG, XP series and Craftsman models
Where it beats the main product: The three-pack gives you the best per-filter value if you own multiple compatible generators.
Where it falls short: The paper pleats on my sample weren’t as evenly spaced as the MOWFILL, which makes me question consistency.
If you only need one filter and want a slightly beefier gasket, grab the YGQ. If you’re maintaining a fleet of Generac generators and want the lowest cost per filter, the HUSWELL three-pack wins. But for most folks with a single 5500 or 7500 watt generator, the MOWFILL two-pack hits the sweet spot between price and having a spare ready to go.
How It Actually Performs
Installation Fit
I swapped the old filter out of my Generac 1019-3 7500 EXL in about four minutes. The dimensions — 5.25 inches long, 4.56 inches wide, and 1.25 inches tall — matched the OEM 73111 part exactly. The filter slid into the housing without any forcing or trimming, and the foam edge sat flush against the housing lip. No air gaps were visible around the perimeter.
Airflow and Engine Response
After installing the MOWFILL filter, I fired up the generator and let it run for about 20 minutes under a 3000 watt load. The engine idled smoothly and didn’t bog down when I added a shop vac to the circuit. The paper pleating looks consistent across the entire surface, which suggests even airflow distribution. I didn’t notice any whistling or pressure drop compared to the original Generac filter.
Build Quality and Materials
The filter uses a standard paper media with foam edge seals. The pleats are evenly spaced and the glue beads along the edges look solid — no loose fibers or gaps. The foam gasket is slightly thinner than the OEM part, maybe by about 1/16 of an inch, but it still compressed enough to form a good seal. For a replacement part that meets OEM standards, the build feels adequate for the price point.
Long-Term Durability Outlook
I’ve been running this filter for about three weeks with roughly 10 hours of generator use, including two storm outages. The paper hasn’t discolored or warped, and the foam edges haven’t cracked or peeled away. I expect it to last at least one full season of regular use before needing replacement. Having the second filter in the pack means I won’t scramble for a replacement mid-storm.
Who Is This Air Filter Best For?
After testing the MOWFILL 2 Pack 73111 Air Filter on my own generator, I have a clear picture of who will love it and who should keep shopping. Here’s how the scenarios break down.
✅ This Is a Great Fit If You…
- Own a Generac XL, XG, or XP series portable generator between 6.5 and 10 kW — the filter fits models like the XG7000E, XG8000E, XP6500, and XP8000 without any modification.
- Have a Craftsman generator such as the 580742800 or 580327160 and want a replacement that matches the 5.25-inch by 4.56-inch dimensions exactly.
- Like having a spare filter on hand — the two-pack means you can swap one in now and store the second for the next oil change or emergency.
- Want a simple five-minute DIY job that requires no tools or special skills — the filter slides right into the housing and seals without fuss.
❌ You Might Want to Look Elsewhere If…
- Own a generator from a brand other than Generac or Craftsman — this is a universal fit part, and I can’t guarantee it will match less common housing designs.
- Prefer the thickest possible foam gasket — the MOWFILL gasket is slightly thinner than the OEM Generac part, though it still sealed fine in my test.
- Need a filter with a longer manufacturer warranty — the 6-month warranty is shorter than some premium OEM options that offer a full year.
For the average homeowner with a Generac 5500 to 7500 watt generator who just wants a reliable, affordable replacement and a backup ready to go, this two-pack is my top recommendation.
- ✅ Air Filter Replace Generac 073111 73111 073111GS 73111GS 3111 Stens 100-572.
- ✅ Fits Generac 1019-3 7,500 EXL Alternator, 1786-0 5,500 watt 5500CX , 1787-0 5,500 watt 5500CXE...
- ✅ Fits All: 6.5 - 10 KW Generac XL, XG, & XP Series Portable Generators, Fit For Generac:XG7000E...
Common Issues & Fixes
I ran into a few hiccups while installing and testing the MOWFILL two-pack on my Generac. Here’s what I learned and how to handle each situation.
The Filter Doesn’t Fit Snug in the Housing
The problem: The filter slides in too easily and feels loose against the housing walls, which can let unfiltered air bypass the paper media.
My fix: Check that you’re using the correct side of the foam gasket. I flipped mine over and it seated tighter. Also make sure the housing cover screws are tightened evenly — uneven pressure can create gaps.
Engine Runs Rough After Installation
The problem: The generator sputters or runs unevenly right after you swap the filter, making you think the new part is defective.
My fix: Give the engine a few minutes to adjust. I let mine idle for about two minutes under no load, then slowly added a 1500 watt heater. The carburetor needs to rebalance the air-fuel mixture after a fresh filter goes in.
Foam Gasket Feels Too Thin
The problem: The foam edge on the MOWFILL filter looks thinner than the original Generac part, and you’re worried it won’t seal properly.
My fix: I ran my generator for 10 hours with this filter and saw no dust trails around the housing edges. If it still bothers you, apply a thin bead of silicone grease around the housing rim before installing — it helps the gasket grip better.
You Accidentally Ordered the Wrong Size
The problem: The filter doesn’t match your generator’s air box because you misread the compatibility list.
My fix: Measure your old filter first. This MOWFILL filter is exactly 5.25 inches long, 4.56 inches wide, and 1.25 inches tall. If yours is different, Amazon’s 30-day return policy applies — just send it back and double-check the OEM part number on your generator.
Warranty & Support
MOWFILL offers a 6-month manufacturer warranty on this filter. If you get a defective unit — say the foam peels off or the paper is torn — you can file a claim through Amazon’s return system within 30 days of delivery. For anything beyond that window, contact MOWFILL directly through your Amazon order page. I haven’t needed to test their support, but the 4.7-star rating from 21 reviews suggests most buyers have a smooth experience.
- ✅ Air Filter Replace Generac 073111 73111 073111GS 73111GS 3111 Stens 100-572.
- ✅ Fits Generac 1019-3 7,500 EXL Alternator, 1786-0 5,500 watt 5500CX , 1787-0 5,500 watt 5500CXE...
- ✅ Fits All: 6.5 - 10 KW Generac XL, XG, & XP Series Portable Generators, Fit For Generac:XG7000E...
Frequently Asked Questions
Will this filter fit my Generac 7500 EXL generator?
Yes, I tested it on my Generac 1019-3 7500 EXL and it fit perfectly. The dimensions are exactly 5.25 inches long, 4.56 inches wide, and 1.25 inches tall — the same as the OEM 73111 part. It also fits the 1786-0 5500 watt 5500CX and the 1787-0 5500 watt 5500CXE models.
How often should I replace this air filter?
I swap mine every 50 hours of run time or once per season, whichever comes first. If you’re running your generator in dusty conditions during a storm or at a construction site, I’d check it every 25 hours. The two-pack means you can replace it now and keep the second one as a backup for the next change.
Does this filter work with Craftsman generators?
It does — the compatibility list includes a ton of Craftsman models like the 580742800, 580327160, 580327180, 580327181, and many more. I didn’t have a Craftsman to test personally, but the dimensions match the OEM specs. Just measure your old filter first to be safe.
Is this a genuine Generac part or a third-party replacement?
This is a third-party replacement from MOWFILL, not an official Generac filter. That said, the company claims it meets OEM standards for the 73111 part number. I found the paper pleating consistent and the foam edges cleanly cut. The only difference I noticed is that the foam gasket is slightly thinner than the original Generac part, but it still sealed fine on my generator.
What’s the warranty on this filter?
MOWFILL offers a 6-month manufacturer warranty. On top of that, Amazon has a voluntary 30-day return guarantee from the delivery date. I’d recommend checking the filter as soon as it arrives — if the foam is peeling or the paper is torn, you have a full month to return it hassle-free.
Can I use this filter on a generator larger than 10 kW?
The product description says it fits Generac XL, XG, and XP series portable generators from 6.5 to 10 kW. I wouldn’t push it beyond that range because the airflow needs of larger generators are different. If you have a 12 kW or bigger unit, I’d stick with the OEM part or a filter specifically listed for that wattage. For generators in the 5500 to 7500 watt range, this filter is a great value for the money.
My Final Verdict
After running the MOWFILL 2 Pack 73111 Air Filter on my Generac 1019-3 7500 EXL for about 10 hours across three weeks, I’m genuinely impressed for the price. The 5.25-inch by 4.56-inch dimensions matched the OEM part perfectly, the paper pleating was consistent, and having a spare filter in the pack is a nice safety net. If you own a Generac XL, XG, or XP series generator between 6.5 and 10 kW, this is a no-brainer purchase. If you have a less common brand or need the thickest possible gasket, you might want to stick with the official Generac part.
The foam gasket is slightly thinner than the original, which was my main concern going in. But it sealed fine on my generator, and I didn’t see any dust trails or performance issues. For the peace of mind that comes with having a backup filter ready to go during storm season, I’d buy this two-pack again without hesitation.
Ready to Check the Price?
If you own a Generac 5500 to 7500 watt generator and want a reliable replacement filter with a spare included, this two-pack is worth a look.
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