---
title: "Rx11 Flush — $33K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/rx11-flush"
last_updated: "2026-08-06T17:20:36.623Z"
locale: en
meta:
description: "Niche score 50/100 · $33K/yr market · 16K searches/yr · $73.56 avg price. A small market ($33K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 50/100 · $33K/yr market · 16K searches/yr · $73.56 avg price. A small market ($33K/yr) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Rx11 Flush — $33K/yr Amazon US Niche (2026) - Flapen"
---
# **rx11 flush**
**Worth a look**
Shows demand growing +122.8% this quarter, but a small market ($33K/yr) keeps it on the watch list.
Market size 8Growth 95Conversion 34Competition 37Returns 71Price range 49Avg price 85Brand share 38Review moat 80Quality gap 38
**Growth**
**Incredible****+122.8%**
90-day search growth — must beat 0% to launch
**Avg price**
**Great****$73.56**
avg listing price — sweet spot $15–$100
**Review moat**
**Great****394.68**
avg incumbent reviews — the moat a new listing must climb
**Returns**
**Good****2.2%**
return rate — above 5% kills the launch gate
**Price range**
**Okay****$20.78–$182.01**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Brand share**
**Okay****82%**
top-5 brand share — brands hold most of the demand
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Competition**
**Okay****63%**
top-5 click share — leaders hold, buyers still browse
**Conversion**
**Okay****2.7%**
search→purchase rate — share of searches ending in a sale
**Market size**
**Bad****$33K**
$33K/yr · 16K searches
**Signals**[** Trending**](https://flapen.com/research/niches?market=us&signal=trending "Search growth > 100% (90d)") [** Low Review Barrier**](https://flapen.com/research/niches?market=us&signal=low_review_barrier "Top brand's reviews < 500") [** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
According to Flapen's Amazon United States niche tracking, rx11 flush is a $33K/yr Amazon United States market (16K searches/yr). The top 5 brands hold 82% of demand. Verdict: Worth a look — 50/100.
Data updated Jul 11, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **rx11 flush market data**
- **Units sold / yr**
- **500–750**
- avg 0–100/product
- **Revenue / yr**
- **$37K–$55K**
- units × avg price
- **Conversion rate**
- **2.7%**
- **Avg BSR**
- **#480**
- **Page quality**
- **0%**
- **Prime**
- **68%**
- **Sponsored**
- **68%**
- **Out of stock**
- **4.6%**
- **Avg brand age**
- **62 months**
- **Avg seller age**
- **172 days**
## **Competition & brand share**
The top 5 products take 63% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**14 **▼falling
**Sellers**
**103**
**Top-5 brand share**
**82%**
Top 20: 100%
**Top-5 click share**
**63%**
Top 20: 100%
**Open market**
**18%**
- Nu-Calgon38% - FOUR UNCLES18% - Leak Saver12% - Four Seasons6% - Rossesay4% - K-Swiss4% - Open — no brand owns it (8 brands, 18%)
## **Top rx11 flush search terms**
- **rx11 flush kit**7K/yr+168.5%3.0% conv. - **rx11 flush**6K/yr+64.9%1.9% conv. - **r11 flush kit**4K/yr+140.9%2.5% conv. [**All search terms **](https://flapen.com/research/us/automotive/rx11-flush/search-terms)
## **Top rx11 flush 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%5%$2K10%$3K15%$5K20%$7K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)1 product missing review or click data not plotted
All 19 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**FOUR UNCLES AC Flush Kit - Air Conditioner System Cleaning Tool Set with Stainless Steel Canister and Nylon Hose & Flushing Spray Gun for R134a R12 R22 R410a R404a(Not Includes Flush Solvent)**FOUR UNCLES**$28.00**4.5★1,427 rev](https://www.amazon.com/dp/B07T7MZ8L5) [2**Nu-Calgon 4300-38 Rx11-Flush Liquid Starter Kit**Nu-Calgon**$182.01**4.8★7 rev](https://www.amazon.com/dp/B01FCBQW4Y) [3**Leak Saver AC Flush Solvent Kit | Pressurized AC Flush Kit Solvent for Cleaning HVAC Line Set and Any Refrigerant-Based Systems**Leak Saver**$69.79**4.3★60 rev](https://www.amazon.com/dp/B0D1H6CNMQ) [4**NU CALGON 4300-09 RX-11 Flush Kit 3-4 Ton-952469**Nu-Calgon**$60.48**4.2★33 rev](https://www.amazon.com/dp/B0086H840C) [5**Nu-Calgon 4300-30 Rx11-Flush Liquid Unpressurized Can 19.5 fl oz**Nu-Calgon**$75.31**4.4★15 rev](https://www.amazon.com/dp/B0186GRXD6)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**K-Swiss Mens Express Light Pickleball Shoes Lightweight Breathable Court Shoe Stable Support Durable Toe Protection White/Daffodil 14 W**K-Swiss**$103.05**2,246 rev1y ago](https://www.amazon.com/dp/B0DBRSK4VS) [**YUANRI AC Flush Kit Home A/C Flush Tool Automotive A/C Flush Kit House AC Flushing Kit 1L Stainless Steel Bottle R134A R12 R22 R404 R410A Air Conditioner System Flush Canister Kit Clean Tool Set**YUANRI**$24.21**74 rev2y ago](https://www.amazon.com/dp/B0D8L19LXX) [**Leak Saver AC Flush Solvent Kit | Pressurized AC Flush Kit Solvent for Cleaning HVAC Line Set and Any Refrigerant-Based Systems**Leak Saver**$69.79**60 rev2y ago](https://www.amazon.com/dp/B0D1H6CNMQ) [**Rossesay AC Flush Kit Air Conditioner System Flush Canister Kit AC Drain Line Cleaner Tool Air Conditioning Pipeline Cleaning Tool Set with Gauge Air Fittings and Hose for Car Air Conditioner Pipe**Rossesay**$42.27**107 rev2y ago](https://www.amazon.com/dp/B0CWR41SYN) [**CMTOOL AC Flush Kit Automotive Home HVAC Flush Tool Thickened Stainless Steel Canister Auto A/C Flushing Kit House Air Conditioning Flushing Bottle Set for R134A R12 R22 R404 R410A System**CMTOOL**$24.27**265 rev3y ago](https://www.amazon.com/dp/B0BT9M5DP7)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**K-Swiss Mens Express Light Pickleball Shoes Lightweight Breathable Court Shoe Stable Support Durable Toe Protection White/Daffodil 14 W**K-Swiss**$103.05**4.2★**▲ 143%**](https://www.amazon.com/dp/B0DBRSK4VS) [**K-Swiss Mens Hypercourt Express 2 Tennis Shoe Vaporous Gray/White/Peacoat 10 M**K-Swiss**$116.21**4.4★**▲ 140%**](https://www.amazon.com/dp/B0BHH8LPJG) [**YUANRI AC Flush Kit Home A/C Flush Tool Automotive A/C Flush Kit House AC Flushing Kit 1L Stainless Steel Bottle R134A R12 R22 R404 R410A Air Conditioner System Flush Canister Kit Clean Tool Set**YUANRI**$24.21**4.8★**▲ 109%**](https://www.amazon.com/dp/B0D8L19LXX) [**Rossesay AC Flush Kit Air Conditioner System Flush Canister Kit AC Drain Line Cleaner Tool Air Conditioning Pipeline Cleaning Tool Set with Gauge Air Fittings and Hose for Car Air Conditioner Pipe**Rossesay**$42.27**4.5★**▲ 41%**](https://www.amazon.com/dp/B0CWR41SYN) [**Leak Saver AC Flush Solvent Kit | Pressurized AC Flush Kit Solvent for Cleaning HVAC Line Set and Any Refrigerant-Based Systems**Leak Saver**$69.79**4.3★**▲ 31%**](https://www.amazon.com/dp/B0D1H6CNMQ)
**~~View all trending →~~**
## **What buyers say about rx11 flush**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Advertised Vs Actual Product**20%
*“It worked as advertised”*
**Quality-Overall**15%
*“Quality A/C Flush tool at a good price”*
**Ease Of Use**14%
*“Easy to use”*
**Efficiency**12%
*“Flush works well with any system”*
**Ease Of Cleaning**7%
*“This cleaning step is essential for maintaining optimal performance”*
**Value For Money**6%
*“Good price and fast shipping”*
**Leak-Proof**6%
*“Doesnt leak”*
**Coolant**4%
*“Well Made HVACR flush fridge cooling system”*
**Design-Overall**3%
*“Built well and works like it should”*
**Pressure**3%
*“One of the key features of this kit is the pressure regulating and relief valve, which adds an important safety measure”*
### **What buyers complain about **
**Functionality-Overall**36%
*“Did not work”*
**Value For Money**14%
*“Cost Me Thousands In Time And Money”*
**Durability**14%
*“Then 2 hours later it tried to use it again and the hose burst open wasting ac flush all over my garage floor”*
**Pressure**14%
*“The pressure dropped almost immediately”*
**Advertised Vs Actual Product**7%
*“My review is only to reflect the inaccurate listing”*
**Natural Resource Wastage**7%
*“all oil was stack in the system waste of money”*
### **Top return reasons **
**Size-Overall**17%
**Functionality-Overall**11%
**Feet Fit**9%
**Advertised Vs Actual Product**9%
**Width**7%
**Leak-Proof**7%
**Length**4%
**Value For Money**4%
**Defective Material/Parts**3%
**Compatibility-Overall**3%
## **Common questions**
- **Is rx11 flush profitable to sell on Amazon United States?**
- The niche generates $33K/yr across 19 tracked products. 90-day search growth is +122.8%. Flapen's verdict: Worth a look (50/100).
- **How competitive is the rx11 flush niche?**
- 14 brands and 103 sellers compete. The top 5 products take 63% of clicks and top 5 brands hold 82% of demand.
- **What do buyers complain about in rx11 flush?**
- Top complaints mined from reviews: Functionality-Overall, Value For Money, Durability. The return rate is 2.2%.
- **What does it cost to enter the rx11 flush niche?**
- Listings span $20.78–$182.01; the average listing price is $73.56 (sweet spot $15–$100). The average incumbent carries 395 reviews — the moat a new listing must climb.
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