---
title: "radiator cap — Niche Verdict: Worth a look (59/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/radiator-cap"
last_updated: "2026-07-13T22:38:44.365Z"
locale: en
meta:
  description: "radiator cap shows a fragmented shelf (top 5 take 23% of clicks), but a failed launch gate (market size, growth, or returns) keeps it on the watch list."
  "og:description": "radiator cap shows a fragmented shelf (top 5 take 23% of clicks), but a failed launch gate (market size, growth, or returns) keeps it on the watch list."
  "og:title": "radiator cap — Niche Verdict: Worth a look (59/100) | Amazon United States - Flapen"
---

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# **radiator cap**

**Worth a look**

Shows a fragmented shelf (top 5 take 23% of clicks), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 46Growth 22Conversion 64Competition 92Returns 53Price range 45Avg price 36Brand share 72Review moat 85Quality gap 76

**Competition**

**Great****23%**

top-5 click share — an open shelf

**Review moat**

**Great****309.48**

avg incumbent reviews — the moat a new listing must climb

**Quality gap**

**Great****4.3★**

avg incumbent rating — lower means beatable quality

**Brand share**

**Good****62%**

top-5 brand share — brands hold most of the demand

**Conversion**

**Good****5.6%**

search→purchase rate — share of searches ending in a sale

**Returns**

**Good****2.9%**

return rate — above 6% kills the launch gate

**Market size**

**Okay****$244K**

$244K/yr · 422K searches

**Price range**

**Okay****$5.07–$23.15**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Avg price**

**Okay****$10.26**

avg listing price — sweet spot $15–$100

**Growth**

**Bad****-6.4%**

90-day search growth — must beat 0% to launch

## **Competition**

Clicks spread well past the top 5 (23% combined) — an open shelf where new products get seen.

**Brands**

**37 **▼falling

**Sellers**

**170**

**Top-5 brand share**

**62%**

**Open market**

**34%**

- Gates23% - MotoRad15% - ACDelco10% - Manymiba9% - RBOKO5% - IHOTDER5%

## **Product shelf**

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

0%2%$5K4%$10K6%$15K8%$20K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 92 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![Gates 31528 Standard Radiator Cap](https://m.media-amazon.com/images/I/41dQoCjfKkL.jpg)**Gates 31528 Standard Radiator Cap**Gates**$8.47**4.6★683 rev](https://www.amazon.com/dp/B000C2SCZ6) [2![ACDelco GM Original Equipment RC27 (10409635) Radiator Fill Cap](https://m.media-amazon.com/images/I/41Eo5g2Z+DL.jpg)**ACDelco GM Original Equipment RC27 (10409635) Radiator Fill Cap**ACDelco**$10.72**4.7★1,950 rev](https://www.amazon.com/dp/B000C9SP4W) [3![Gates 31336 Radiator Cap](https://m.media-amazon.com/images/I/51qvfJEY2OL.jpg)**Gates 31336 Radiator Cap**Gates**$12.48**4.4★851 rev](https://www.amazon.com/dp/B000C2WEM8) [4![Car Radiator Cap Coolant Reservoir Cap OEM#16401-31520 1640131520 Standard Radiator Coolant Reservoir Tank Cap Compatible with Lexus Toyota Scion Auto Replacement Parts(for Lexus)](https://m.media-amazon.com/images/I/412nWwzGzXL.jpg)**Car Radiator Cap Coolant Reservoir Cap OEM#16401-31520 1640131520 Standard Radiator Coolant Reservoir Tank Cap Compatible with Lexus Toyota Scion Auto Replacement Parts(for Lexus)**IHOTDER**$5.96**4.6★152 rev](https://www.amazon.com/dp/B0CQR7G14F) [5![Teybouk High Pressure Radiator Cap Cover 1.8 bar Vehicle Radiator Cap Temperature Gauge 1.85 x 2.55 Water Tank Sealing Cover Universal for Suzuki Yamaha Motorcycle ATV Models (Black)](https://m.media-amazon.com/images/I/412AsZse8QL.jpg)**Teybouk High Pressure Radiator Cap Cover 1.8 bar Vehicle Radiator Cap Temperature Gauge 1.85 x 2.55 Water Tank Sealing Cover Universal for Suzuki Yamaha Motorcycle ATV Models (Black)**Teybouk**$10.04**3.2★27 rev](https://www.amazon.com/dp/B0FXM4S274)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![CCNU 1.8 Bar Radiator Cap with Temperature Gauge High Pressure Radiator Cover 25.6 PSI Water Tank Cap Universal Fit for Motorcycle ATV Dirt Bike Compatible with Honda Kawasaki Suzuki Yamaha KTM](https://m.media-amazon.com/images/I/41d6b99xVAL.jpg)**CCNU 1.8 Bar Radiator Cap with Temperature Gauge High Pressure Radiator Cover 25.6 PSI Water Tank Cap Universal Fit for Motorcycle ATV Dirt Bike Compatible with Honda Kawasaki Suzuki Yamaha KTM**CCNU**$9.98**3 rev2mo ago](https://www.amazon.com/dp/B0GX57VKBN) [![Icyfond Car Radiator Cap Radiator Cap Replacement OEM#16401-31520 16401-31650 Standard Radiator Coolant Reservoir Tank Cap Compatible with Lexus Toyota Scion Auto Replacement Parts](https://m.media-amazon.com/images/I/41h3a5dwMyL.jpg)**Icyfond Car Radiator Cap Radiator Cap Replacement OEM#16401-31520 16401-31650 Standard Radiator Coolant Reservoir Tank Cap Compatible with Lexus Toyota Scion Auto Replacement Parts**Icyfond**$6.01**2 rev5mo ago](https://www.amazon.com/dp/B0GLZ958CP) [![YUPIKJI Radiator Cap Engine Coolant Anti-Heat Cap Compatible with 1994-2006 Honda Accord 1992-2005 Civic 1997-2005 CRV 1995-2007 Odyssey 2003-2008 Pilot Repalces OEM# 19045-PAA-A01 19045-RAA-003](https://m.media-amazon.com/images/I/41Smu52oLRL.jpg)**YUPIKJI Radiator Cap Engine Coolant Anti-Heat Cap Compatible with 1994-2006 Honda Accord 1992-2005 Civic 1997-2005 CRV 1995-2007 Odyssey 2003-2008 Pilot Repalces OEM# 19045-PAA-A01 19045-RAA-003**YUPIKJI**$5.07**1 rev6mo ago](https://www.amazon.com/dp/B0GCYKXBSF) [![KoiLuvGo Radiator Cover High Pressure Radiator Cap with Temperature Gauge 1.8 Bar High Pressure Radiator Cap Compatible with Honda Kawasaki Suzuki Yamaha KTM and More Motorcycle ATV Models](https://m.media-amazon.com/images/I/41g90gnUgkL.jpg)**KoiLuvGo Radiator Cover High Pressure Radiator Cap with Temperature Gauge 1.8 Bar High Pressure Radiator Cap Compatible with Honda Kawasaki Suzuki Yamaha KTM and More Motorcycle ATV Models**KoiLuvGo**$10.97**6 rev6mo ago](https://www.amazon.com/dp/B0G1RSYZZ8) [![Teybouk Radiator Cap Replacement Radiator Cover 16 PSI Stainless Steel Engine Seal Cover Compatible with Dodge and Jeep Vehicles (Silver)](https://m.media-amazon.com/images/I/41WHtE54nqL.jpg)**Teybouk Radiator Cap Replacement Radiator Cover 16 PSI Stainless Steel Engine Seal Cover Compatible with Dodge and Jeep Vehicles (Silver)**Teybouk**$6.37**10 rev6mo ago](https://www.amazon.com/dp/B0FZ8HHDBJ)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![CCNU 1.8 Bar Radiator Cap with Temperature Gauge High Pressure Radiator Cover 25.6 PSI Water Tank Cap Universal Fit for Motorcycle ATV Dirt Bike Compatible with Honda Kawasaki Suzuki Yamaha KTM](https://m.media-amazon.com/images/I/41d6b99xVAL.jpg)**CCNU 1.8 Bar Radiator Cap with Temperature Gauge High Pressure Radiator Cover 25.6 PSI Water Tank Cap Universal Fit for Motorcycle ATV Dirt Bike Compatible with Honda Kawasaki Suzuki Yamaha KTM**CCNU**$9.98**2.5★**▲ 285%**](https://www.amazon.com/dp/B0GX57VKBN) [![Racing Safety Lever Radiator Cap](https://m.media-amazon.com/images/I/51S8CzDeqML.jpg)**Racing Safety Lever Radiator Cap**MotoRad**$10.74**4.7★**▲ 264%**](https://www.amazon.com/dp/B0BM6MTS4M) [![MotoRad T208 Racing Radiator cap](https://m.media-amazon.com/images/I/51BWdMbWwVL.jpg)**MotoRad T208 Racing Radiator cap**MotoRad**$9.58**4.3★**▲ 229%**](https://www.amazon.com/dp/B0BM6PMXCT) [![Radiator Cap for Honda Acura 1995-2022 Accord 2003-2022 Pilot 1997-2020 CR-V 1995-2023 Odyssey 2006-2014 Ridgeline 1992-2015 Civic 2001-2020 MDX 2007-2024 RDX 2011-2016 CR-Z 19045-PAA-A01](https://m.media-amazon.com/images/I/41YuvoGtVLL.jpg)**Radiator Cap for Honda Acura 1995-2022 Accord 2003-2022 Pilot 1997-2020 CR-V 1995-2023 Odyssey 2006-2014 Ridgeline 1992-2015 Civic 2001-2020 MDX 2007-2024 RDX 2011-2016 CR-Z 19045-PAA-A01**Manymiba**$9.75**3.8★**▲ 215%**](https://www.amazon.com/dp/B0FYPJW1ZR) [![Radiator Cap - 16 PSI Original Equipment Replacement with Dual Lug Design Sealed Cooling System Pressure Cap Universal Fit for Most Cars (Silver)](https://m.media-amazon.com/images/I/41xMhB4KcrL.jpg)**Radiator Cap - 16 PSI Original Equipment Replacement with Dual Lug Design Sealed Cooling System Pressure Cap Universal Fit for Most Cars (Silver)**LTDCVTR**$6.87**4.2★**▲ 209%**](https://www.amazon.com/dp/B0G77P83NM)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 104 weeks — -6.4% search growth over the last 90 days.

9K7K seasonSepDecMarJunAugNovMarMay

No pronounced peak months · busiest ÷ quietest = 1.2×

## **Reviews**

What buyers praise and complain about, mined from review topics.

### **What buyers love **

**Size-Overall**41%

*“Direct fit”*

**Quality-Overall**19%

*“The build quality feels solid”*

**Value For Money**9%

*“Worth it”*

**Advertised Vs Actual Product**8%

*“Just as advertised”*

**Leak-Proof**4%

*“No leaks after installation”*

**Efficiency**4%

*“Works as intended”*

**Pressure**2%

*“Holds pressure well”*

**Coolant**2%

*“Works perfectly, solved my coolant odor problem”*

**Assembly/Installation**1%

*“Easy installation”*

**Strength**1%

*“Well built cap”*

### **What buyers complain about **

**Size-Overall**17%

*“Didn't fit”*

**Compatibility-Overall**17%

*“Does not fit the v6 engine”*

**Leak-Proof**11%

*“will start to leak”*

**Quality-Overall**10%

*“Bad quality”*

**Coolant**7%

*“cause all my coolant to spill out”*

**Advertised Vs Actual Product**6%

*“False info”*

**Heating**3%

*“Truck overheated”*

**Pressure**3%

*“the bar pressure is to high”*

**Functionality-Overall**2%

*“Dose not work”*

**Durability**2%

*“Failed in 3 months”*

### **Top return reasons **

**Size-Overall**61%

**Compatibility-Overall**13%

**Advertised Vs Actual Product**4%

**Coolant**4%

**Pressure**4%

**Defective Material/Parts**3%

**Leak-Proof**2%

**Functionality-Overall**2%

**Value For Money**2%

**Product Condition**1%