---
title: "Donaldson P821575 Air Filter — $97K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/donaldson-p821575-air-filter"
last_updated: "2026-08-10T19:37:44.898Z"
locale: en
meta:
description: "Niche score 53/100 · $97K/yr market · 24K searches/yr. A concentrated shelf (top 5 take 80% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 53/100 · $97K/yr market · 24K searches/yr. A concentrated shelf (top 5 take 80% of clicks) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Donaldson P821575 Air Filter — $97K/yr Amazon US Niche (2026) - Flapen"
---
# **donaldson p821575 air filter**
**Worth a look**
Shows searches that convert (16.3% search→purchase), but a concentrated shelf (top 5 take 80% of clicks) keeps it on the watch list.
Market size 24Growth 57Conversion 98Competition 16Returns 95Price range 95Avg price 95Brand share 31Review moat 91Quality gap 20
**Conversion**
**Incredible****16.3%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.9%**
return rate — above 5% kills the launch gate
**Avg price**
**Incredible****$24.51**
avg listing price — sweet spot $15–$100
**Price range**
**Incredible****$15.12–$58.94**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Great****189.9**
avg incumbent reviews — the moat a new listing must climb
**Growth**
**Good****+32.0%**
90-day search growth — must beat 0% to launch
**Brand share**
**Okay****86%**
top-5 brand share — brands hold most of the demand
**Market size**
**Bad****$97K**
$97K/yr · 24K searches
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****80%**
top-5 click share — a locked-up shelf
**Signals**[** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500")
According to Flapen's Amazon United States niche tracking, donaldson p821575 air filter is a $97K/yr Amazon United States market (24K searches/yr). The top 5 brands hold 86% of demand. Demand peaks in Mar–Apr–May. Verdict: Worth a look — 53/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **donaldson p821575 air filter market data**
- **Units sold / yr**
- **5K–6K**
- avg 250–500/product
- **Revenue / yr**
- **$123K–$147K**
- units × avg price
- **Conversion rate**
- **16.3%**
- **Avg BSR**
- **#1,808**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **90%**
- **Out of stock**
- **0.6%**
- **Avg brand age**
- **30 months**
- **Avg seller age**
- **177 days**
## **Competition & brand share**
The top 5 products capture 80% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**8 **▼falling
**Sellers**
**27**
**Top-5 brand share**
**86%**
Top 20: 100%
**Top-5 click share**
**80%**
Top 20: 100%
**Open market**
**6%**
- Donaldson31% - Deflife23% - C-Tzu14% - Aftermarket Filtration Experts9% - Hipa9% - Generic8% - Open — no brand owns it (2 brands, 6%)
## **Demand & seasonality**
Weekly Amazon search volume, last 103 weeks — +32.0% search growth over the last 90 days.
2K1KSpike '25Spike '26 seasonDecMarJunAugNovMarMay
Peak months: Mar, Apr, May · busiest ÷ quietest = 8.3×
[**Open Trend **](https://flapen.com/research/us/automotive/donaldson-p821575-air-filter/trend)
## **Top donaldson p821575 air filter search terms**
- **donaldson p821575 air filter**11K/yr+43.1%15.8% conv. - **p821575**6K/yr+36.3%13.1% conv. - **donaldson p821575**4K/yr+34.4%10.2% conv. - **p821575 air filter**3K/yr-28.9%13.8% conv. [**All search terms **](https://flapen.com/research/us/automotive/donaldson-p821575-air-filter/search-terms)
## **Top donaldson p821575 air filter products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%10%$10K20%$19K30%$29K40%$39K101001K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 10 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Donaldson P821575 Primary Radial Seal Air Filter**Donaldson**$20.69**4.8★485 rev](https://www.amazon.com/dp/B00KNIUUCC) [2**For Kawasaki 11013-7044 & 11013-7045 Inner & Outer Air Filter Cleaners Combo OEM for Donaldson Kohler 25-083-01-S P821575 & P822858**Deflife**$15.66**4.8★672 rev](https://www.amazon.com/dp/B0936YMQ4V) [3**P821575 & P822858 Outer Air Filter & Inner Filter 11013-7044 & 11013-7045 Compatible with Donaldson FPG05 Air Cleaners Replaces #6672467 6672468 PM252Z PM260Z**C-Tzu**$15.57**4.3★37 rev](https://www.amazon.com/dp/B0D7VRNVQF) [4**Hipa P821575 P822858 Outer Inner Air Filter for Donaldson FPG05 New Holland TC30 TC33D T1520 TC29D Kubota L3130 L4600 L3940 L3940 L3300**Hipa**$17.42**4.6★247 rev](https://www.amazon.com/dp/B0BKZM3H4X) [5**C-Tzu P821575 & P822858 Outer Air Filter & Inner Filter Compatible with Donaldson FPG05 Air Cleaners**Generic**$15.65**4.6★119 rev](https://www.amazon.com/dp/B0C589953X)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**P821575 & P822858 Outer Air Filter & Inner Filter 11013-7044 & 11013-7045 Compatible with Donaldson FPG05 Air Cleaners Replaces #6672467 6672468 PM252Z PM260Z**C-Tzu**$15.57**37 rev2y ago](https://www.amazon.com/dp/B0D7VRNVQF) [**2 Sets P821575 & P822858 Outer Air Filter & Inner Filter Compatible with Donaldson FPG05 Air Cleaners Replaces 6672467 6672468**C-Tzu**$24.99**18 rev2y ago](https://www.amazon.com/dp/B0CHVRPLGL) [**P821575 & P822858 Outer Inner Air Filter Air Cleaner for Bobcat FPG05 Air Cleaners Replaces# 6672467 6672468 PM252Z PM260Z**X4XZ**$15.12**109 rev3y ago](https://www.amazon.com/dp/B0C5H23RM4) [**C-Tzu P821575 & P822858 Outer Air Filter & Inner Filter Compatible with Donaldson FPG05 Air Cleaners**Generic**$15.65**119 rev3y ago](https://www.amazon.com/dp/B0C589953X) [**Hipa P821575 P822858 Outer Inner Air Filter for Donaldson FPG05 New Holland TC30 TC33D T1520 TC29D Kubota L3130 L4600 L3940 L3940 L3300**Hipa**$17.42**247 rev3y ago](https://www.amazon.com/dp/B0BKZM3H4X)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Donaldson P821575 Air Filter Primary (Pack of 3)**Aftermarket Filtration Experts**$58.94**5.0★**▲ 61%**](https://www.amazon.com/dp/B01IX021CS) [**For Kawasaki 11013-7044 & 11013-7045 Inner & Outer Air Filter Cleaners Combo OEM for Donaldson Kohler 25-083-01-S P821575 & P822858**Deflife**$15.66**4.8★**▲ 56%**](https://www.amazon.com/dp/B0936YMQ4V) [**Donaldson P821575 Air Filter Primary (Pack of 2)**Aftermarket Filtration Experts**$35.73**4.9★**▲ 45%**](https://www.amazon.com/dp/B01LYJRSI5) [**Hipa P821575 P822858 Outer Inner Air Filter for Donaldson FPG05 New Holland TC30 TC33D T1520 TC29D Kubota L3130 L4600 L3940 L3940 L3300**Hipa**$17.42**4.6★**▲ 42%**](https://www.amazon.com/dp/B0BKZM3H4X) [**2sets Air Filters Fit for Donaldson P821575 & P822858 Kawasaki 11013-7044 11013-7045 Briggs & Stratton 841497 821136 Fleetguard AF25551 AF25552**OLIFANT**$25.32**4.7★**▲ 31%**](https://www.amazon.com/dp/B09YMFHXVX)
**~~View all trending →~~**
## **What buyers say about donaldson p821575 air filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**36%
*“Fit perfect”*
**Filtration**16%
*“Exact air filter”*
**Quality-Overall**15%
*“Good quality”*
**Value For Money**12%
*“Great product reasonably priced”*
**Advertised Vs Actual Product**10%
*“Worked and appeared oem”*
**Efficiency**6%
*“Work perfectly”*
**Assembly/Installation**3%
*“easy to install”*
**Ease Of Cleaning**3%
*“Clean machine”*
### **What buyers complain about **
**Filtration**50%
*“The inner filter seldom encounters dirt”*
**Advertised Vs Actual Product**38%
*“False advertising”*
**Compatibility-Overall**13%
*“This filter does not fit the Kubota L3300”*
### **Top return reasons **
**Size-Overall**63%
**Compatibility-Overall**17%
**Filtration**9%
**Advertised Vs Actual Product**4%
**Quality-Overall**3%
**Defective Material/Parts**2%
**Functionality-Overall**1%
**Design-Overall**1%
**Value For Money**1%
**Motor Issues**1%
## **Common questions**
- **Is donaldson p821575 air filter profitable to sell on Amazon United States?**
- The niche generates $97K/yr across 10 tracked products. 90-day search growth is +32.0%. Flapen's verdict: Worth a look (53/100).
- **How competitive is the donaldson p821575 air filter niche?**
- 8 brands and 27 sellers compete. The top 5 products take 80% of clicks and top 5 brands hold 86% of demand.
- **What do buyers complain about in donaldson p821575 air filter?**
- Top complaints mined from reviews: Filtration, Advertised Vs Actual Product, Compatibility-Overall. The return rate is 0.9%.
- **When does demand for donaldson p821575 air filter peak?**
- Demand peaks in Mar–Apr–May; the busiest month runs 8.3× the quietest.
- **What does it cost to enter the donaldson p821575 air filter niche?**
- Listings span $15.12–$58.94; the average listing price is $24.51 (sweet spot $15–$100). The average incumbent carries 190 reviews — the moat a new listing must climb.
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