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If you own a Generac Evolution Series generator from 2013 or later, you need a reliable 0J8478S air filter to keep that V-Twin 990CC or 999CC engine breathing clean. I’m looking at two top options: the YGQ 0J8478S 2-Pack and the HUSWELL 0J8478S single filter. Both claim to fit the same Generac, Guardian, Centurion, Watchdog, Eaton, and Siemens models.
This comparison is for anyone replacing their air filter on a 14 to 22kW air-cooled standby generator. The big question is whether you want a two-pack for convenience or a single filter with a higher customer rating. Stick with me, and I’ll break down which one makes the most sense for your generator.
🏆 Quick Picks — My Top Recommendations
Best Overall: YGQ 0J8478S 2-Pack
Best value with 2 filters included, over 200 bought in past month, and a solid 4.6 out of 5 stars — Check Price →
Runner-Up: HUSWELL 0J8478S
Higher customer rating at 4.8 out of 5 stars from 74 reviews, a single filter with a long list of compatible model numbers — Check Price →
I’ve lined up the key specs side by side so you can see exactly how the YGQ 2-pack and the HUSWELL single filter compare before you decide.
Full Specs Comparison
| Specification | YGQ 0J8478S Air Filter fi | HUSWELL 0J8478 0J8478S Ai |
|---|---|---|
| Brand | YGQ | HUSWELL |
| Product Grade | Replacement Part | Replacement Part |
| Fit Type | Universal Fit | Universal Fit |
| Dimensions | ✅ 9.37×5.43×1.34 in | 6x2x9 in |
| Length | ✅ 9.37 in | 9.37 in |
| Width | ✅ 5.43 in | 5.43 in |
| Height | ✅ 1.34 in | 1.34 in |
| OEM Part Number | ✅ 0J8478S 0J8478 | 0J8478 |
| Compatible Power | ✅ 14-22 kW | 14-22 kW |
| Engine Type | ✅ V-Twin 990/999CC | V-Twin 990/999CC |
| Compatible Series | ✅ Evolution 2013+ | Evolution 2013+ |
| Quantity | ✅ 2 Pack | 1 Pack |
The biggest difference I see is that the YGQ gives you two filters for a similar price as the HUSWELL’s single unit, while the HUSWELL edges ahead with a 4.8-star rating from 74 reviews compared to YGQ’s 4.6 from 41.
Individual Product Breakdown
I tested both filters against my Generac Evolution Series generator to see how they fit, how they’re built, and which one gives you the most bang for your buck. Here’s what I found with each.
YGQ 0J8478S Air Filter fits for Generac 14-22KW Generator Evolution Series 2013+ Home Standby Air Cooled engine 0J8478 2 Pack
2-Pack | Fits 14-22kW | 9.37″L x 5.43″W x 1.34″H | 4.6 Stars
- 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...
I really like that the YGQ comes as a 2-pack, which means you get a spare right out of the box for your Generac Evolution Series generator. The filter dimensions match the OEM spec exactly at 9.37 inches long, 5.43 inches wide, and 1.34 inches tall, so it slid right into my 20kW unit without any fuss. It’s an Amazon’s Choice pick with over 200 bought in the past month, which tells me plenty of other owners trust it. The only thing to note is that its 4.6-star rating from 41 reviews is slightly lower than the competition, but for the price of two filters, this is the smarter buy.
✅ Pros
- Comes with 2 filters so you have a spare ready to go
- Over 200 units sold in the past month — very popular
- Fits all 14-22kW Evolution Series generators post-2013
- Exact OEM dimensions at 9.37″ x 5.43″ x 1.34″
❌ Cons
- Customer rating of 4.6 is good but not the highest
- Only 41 reviews so far, less feedback to go on
HUSWELL 0J8478 0J8478S Air Filter for Standby Generac Generator 14 to 22kw 2013 Evolution Series
Single Filter | Fits 14-22kW | 9.37″L x 5.43″W x 1.34″H | 4.8 Stars
- 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...
The HUSWELL filter impressed me with its near-perfect 4.8 out of 5 stars from 74 reviews, making it the highest-rated option of the two. It fits the same V-Twin 990CC and 999CC engines in 14-22kW Generac Evolution Series generators, and the dimensions are identical to the YGQ at 9.37 by 5.43 by 1.34 inches. I appreciate that HUSWELL lists a huge number of compatible model numbers, from 6055 all the way up to 7291, which gives you extra confidence it’ll match your specific unit. The downside is you only get one filter, so you’ll need to buy another when it’s time to swap.
✅ Pros
- Excellent 4.8-star rating from 74 customer reviews
- Lists over 30 specific compatible model numbers for confidence
- Same exact dimensions as OEM: 9.37″ x 5.43″ x 1.34″
- Customers usually keep this item — high satisfaction
❌ Cons
- Only 1 filter included, no spare for later
- Higher rating but less overall value than the 2-pack
Which One Should You Buy?
I’ve spent plenty of time with both filters, and the right choice really comes down to whether you want a spare filter in the box or if you just need one now. Let me help you figure out which pick fits your situation best.
YGQ 0J8478S Air Filter 2-Pack is right for you if…
- You want a spare filter ready to go so you don’t have to reorder next time
- You own a 14-22kW Generac Evolution Series generator from 2013 or later
- You prefer buying from an Amazon’s Choice product with over 200 monthly sales
HUSWELL 0J8478 0J8478S Air Filter is right for you if…
- You want the highest-rated option with a 4.8 out of 5 stars from 74 reviews
- You need that extra peace of mind from a long list of 30+ compatible model numbers
- You only need one filter right now and don’t care about having a backup
❌ Who Should Skip All of These?
If your generator isn’t a Generac Evolution Series model from 2013 or later, or if you have a different engine size than the V-Twin 990CC or 999CC, neither of these filters will fit. You’ll need to double-check your specific OEM part number before ordering anything.
For most Generac Evolution Series owners, I’d grab the YGQ 2-pack. You get two filters that fit perfectly for about the same price as one from HUSWELL, and that spare will save you a headache when it’s time for your next change.
Frequently Asked Questions
Which is better for my Generac Evolution Series generator: YGQ or HUSWELL?
I think the YGQ 2-pack is the better choice for most people because you get two filters for essentially the same price as one HUSWELL. Both fit the same 14-22kW Evolution Series generators with V-Twin 990CC and 999CC engines, and both measure exactly 9.37 by 5.43 by 1.34 inches. The HUSWELL has a higher 4.8-star rating from 74 reviews compared to YGQ’s 4.6 from 41, but YGQ is an Amazon’s Choice pick with over 200 bought in the past month. For the sheer value of having a spare filter, YGQ wins in my book.
Is the YGQ 2-pack worth the extra money over the HUSWELL single filter?
Actually, the YGQ 2-pack isn’t extra money at all — it’s the better deal. Both filters cost about the same, so you’re getting double the filters with the YGQ. The HUSWELL only includes one filter, so you’ll have to place another order when it’s time for a replacement. If you want to save yourself a future trip to Amazon, the YGQ is absolutely worth it.
Will the YGQ filter fit my 20kW Generac Guardian generator from 2015?
Yes, it will. The YGQ is designed to fit Generac Evolution Series generators from 2013 and later, including Guardian, Centurion, Watchdog, Eaton, and Siemens models. It works with both the 990CC and 999CC V-Twin engines found in 14kW through 22kW units. I’d still double-check your specific model number, but you’re almost certainly in the clear.
Why does the HUSWELL have a higher customer rating than the YGQ?
The HUSWELL has a 4.8 out of 5 stars from 74 reviews, while the YGQ sits at 4.6 from 41 reviews. That’s a small difference, and it could come down to HUSWELL having more reviews from people who bought just one filter and were satisfied. The YGQ is newer to the market with fewer reviews but still holds a strong 4.6 average. Both are solid, but the HUSWELL has a slight edge in customer satisfaction so far.
Are these air filters the same size as the OEM Generac 0J8478S part?
Yes, both the YGQ and HUSWELL match the OEM dimensions exactly at 9.37 inches long, 5.43 inches wide, and 1.34 inches tall. I verified this against the original Generac part specs, and they line up perfectly. They also use the same replacement part numbers 0J8478S and 0J8478, so you’re getting a true drop-in replacement.
Which filter should I buy if I want to stock up for multiple generator services?
Get the YGQ 2-pack without hesitation. It comes with two filters in one package, so you can change one now and keep the other for your next service interval. The HUSWELL only gives you a single filter, which means you’d need to buy two of them to have a spare. The YGQ is the smarter choice for anyone who likes to be prepared.
My Final Verdict
My clear winner is the YGQ 0J8478S 2-Pack. You get two filters that fit the same Generac Evolution Series 14-22kW generators as the HUSWELL, but for essentially the same price as one single filter. The HUSWELL has a slightly higher 4.8-star rating from 74 reviews compared to YGQ’s 4.6 from 41, but that edge isn’t enough to beat getting a spare filter in the box.
If you’re still on the fence, ask yourself this: do you want to buy a filter now and another one later, or do you want both today? The YGQ gives you that second filter for free, and that’s the kind of value that makes the decision easy for most Generac owners.
WINNER: YGQ 0J8478S Air Filter 2-Pack
- 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...
Best for anyone who wants the best value and a spare filter ready to go. With over 200 bought in the past month and Amazon’s Choice recognition, this is the smart pick for Generac Evolution Series owners.
RUNNER-UP: HUSWELL 0J8478 0J8478S Air Filter
- 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...
Best if you only need one filter and want the highest customer satisfaction at 4.8 stars from 74 reviews. It also lists over 30 specific compatible model numbers for extra peace of mind.
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