---
title: "b&b model 571 check valve — Niche Verdict: Worth a look (59/100) | Amazon United States - Flapen"
canonical_url: "https://flapen.com/amazon/research/us/automotive/b-b-model-571-check-valve"
last_updated: "2026-07-14T01:25:54.850Z"
locale: en
meta:
  description: "b&b model 571 check valve shows demand growing +154.5% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list."
  "og:description": "b&b model 571 check valve shows demand growing +154.5% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list."
  "og:title": "b&b model 571 check valve — Niche Verdict: Worth a look (59/100) | Amazon United States - Flapen"
---

Back to Flapen home

# **b&b model 571 check valve**

**Worth a look**

Shows demand growing +154.5% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.

Market size 12Growth 96Conversion 92Competition 20Returns 52Price range 93Avg price 95Brand share 41Review moat 93Quality gap 72

**Growth**

**Incredible****+154.5%**

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

**Avg price**

**Incredible****$24.06**

avg listing price — sweet spot $15–$100

**Review moat**

**Great****142.86**

avg incumbent reviews — the moat a new listing must climb

**Price range**

**Great****$13.69–$59.39**

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

**Conversion**

**Great****11.2%**

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

**Quality gap**

**Good****4.3★**

avg incumbent rating — lower means beatable quality

**Returns**

**Good****2.9%**

return rate — above 6% kills the launch gate

**Brand share**

**Okay****80%**

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

**Competition**

**Bad****75%**

top-5 click share — a locked-up shelf

**Market size**

**Bad****$47K**

$47K/yr · 17K searches

## **Competition**

The top 5 products capture 75% of clicks — a locked-up shelf that new listings rarely crack.

**Brands**

**13 **▼falling

**Sellers**

**51**

**Top-5 brand share**

**80%**

**Open market**

**16%**

- Lisnhlin25% - RecPro21% - folosem18% - NOVINO11% - Dusledel5% - MIYIMORE4% - Open — no brand owns it (7 brands, 16%)

## **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%10%$5K20%$9K30%$14K40%$19K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales

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

All 14 tracked products in this niche — three views at once, no toggling.

### **Top sellers**

by 90-day click share

[1![RecPro RV Vacuum Breaker Check Valve | Protect Fresh Water From Pollutants 571-VAC-CHK-A | Made in America](https://m.media-amazon.com/images/I/41U2k3BOnPL.jpg)**RecPro RV Vacuum Breaker Check Valve | Protect Fresh Water From Pollutants 571-VAC-CHK-A | Made in America**RecPro**$24.96**4.6★1,039 rev](https://www.amazon.com/dp/B085CNLP9R) [2![RV Vacuum Breaker Check Valve Fit for b&b Model 571 Check Valve 571-VAC-CHK-A Camper Trailer Flusher Check Valve Replace Backflow Preventer on Black Tank System Prevent Leaking Improve Freshwater](https://m.media-amazon.com/images/I/3162YdHkA2L.jpg)**RV Vacuum Breaker Check Valve Fit for b&b Model 571 Check Valve 571-VAC-CHK-A Camper Trailer Flusher Check Valve Replace Backflow Preventer on Black Tank System Prevent Leaking Improve Freshwater**folosem**$16.79**4.0★41 rev](https://www.amazon.com/dp/B0DN5RHQCM) [3![RV Vacuum Breaker Check Valve Fit for b&b Model 571 Check Valve 571-VAC-CHK-A Camper Trailer Flusher Check Valve Replace Leaking Vacuum Breaker on Black Tank System](https://m.media-amazon.com/images/I/41zg6zAXGwL.jpg)**RV Vacuum Breaker Check Valve Fit for b&b Model 571 Check Valve 571-VAC-CHK-A Camper Trailer Flusher Check Valve Replace Leaking Vacuum Breaker on Black Tank System**Lisnhlin**$18.77**4.1★103 rev](https://www.amazon.com/dp/B0CR4414BR) [4![Upgraded Brass RV Vacuum Breaker Check Valve 571-VAC-CHK-A Camper Trailer Flusher Check Valve fit for b&b Model 571 Check valve Replace Leaking Vacuum Breaker on Black Tank System 1/2 DN Male](https://m.media-amazon.com/images/I/41qFJmO3YAL.jpg)**Upgraded Brass RV Vacuum Breaker Check Valve 571-VAC-CHK-A Camper Trailer Flusher Check Valve fit for b&b Model 571 Check valve Replace Leaking Vacuum Breaker on Black Tank System 1/2 DN Male**Lisnhlin**$28.79**4.1★66 rev](https://www.amazon.com/dp/B0D4Z8RDRG) [5![RV Vacuum Breaker Check Valve Camper RV Black Tank Flush Check Valve Replace Leak Vacuum Breaker on Black Tank System Loud Noise & Wet Floor Camper Backflow Preventer Improve Freshwater 571-VAC-CHK-A](https://m.media-amazon.com/images/I/41IhkwC6oFL.jpg)**RV Vacuum Breaker Check Valve Camper RV Black Tank Flush Check Valve Replace Leak Vacuum Breaker on Black Tank System Loud Noise & Wet Floor Camper Backflow Preventer Improve Freshwater 571-VAC-CHK-A**NOVINO**$18.49**4.1★355 rev](https://www.amazon.com/dp/B0C23RD7W4)

**~~View all top sellers →~~**

### **Newest**

by launch date

[![Rogierra RV Vacuum Breaker Check Valve 571-VAC-CHK-A Brass Backflow Preventer for RV Black Tank Flusher System - Fix Leaks Noise & Wet Floor Compatible with Model 571 1/2 Male Thread](https://m.media-amazon.com/images/I/41TZOby2pJL.jpg)**Rogierra RV Vacuum Breaker Check Valve 571-VAC-CHK-A Brass Backflow Preventer for RV Black Tank Flusher System - Fix Leaks Noise & Wet Floor Compatible with Model 571 1/2 Male Thread**Rogierra**$24.92**8 rev10mo ago](https://www.amazon.com/dp/B0FQHFX21C) [![RV Vacuum Breaker Check Valve Fit for b&b Model 571 Check Valve 571-VAC-CHK-A Camper Trailer Flusher Check Valve Replace Backflow Preventer on Black Tank System Prevent Leaking Improve Freshwater](https://m.media-amazon.com/images/I/3162YdHkA2L.jpg)**RV Vacuum Breaker Check Valve Fit for b&b Model 571 Check Valve 571-VAC-CHK-A Camper Trailer Flusher Check Valve Replace Backflow Preventer on Black Tank System Prevent Leaking Improve Freshwater**folosem**$16.79**41 rev1y ago](https://www.amazon.com/dp/B0DN5RHQCM) [![Upgrade 1/2 MPT 571-VAC-CHK-A RV Vacuum Breaker Check Valve for Camper RV Black Tank System Replace b&b Model 571 Check valve 2-Year Warranty](https://m.media-amazon.com/images/I/31la1ZMktQL.jpg)**Upgrade 1/2 MPT 571-VAC-CHK-A RV Vacuum Breaker Check Valve for Camper RV Black Tank System Replace b&b Model 571 Check valve 2-Year Warranty**supeiqality**$16.06**30 rev1y ago](https://www.amazon.com/dp/B0DHGPNMYQ) [![Upgraded Brass RV Vacuum Breaker Check Valve 571-VAC-CHK-A Camper Trailer Flusher RV Tank Check Valve for b&b Model 571 Check Valve Replace Leaking Vacuum Breaker on Black Tank System](https://m.media-amazon.com/images/I/41O1ZY96NCL.jpg)**Upgraded Brass RV Vacuum Breaker Check Valve 571-VAC-CHK-A Camper Trailer Flusher RV Tank Check Valve for b&b Model 571 Check Valve Replace Leaking Vacuum Breaker on Black Tank System**maXpeedingrods**$24.87**15 rev1y ago](https://www.amazon.com/dp/B0DC6J77DG) [![Upgraded Brass RV Vacuum Breaker Check Valve 571-VAC-CHK-A Camper Trailer Flusher Check Valve fit for b&b Model 571 Check valve Replace Leaking Vacuum Breaker on Black Tank System 1/2 DN Male](https://m.media-amazon.com/images/I/417uxb1GaTL.jpg)**Upgraded Brass RV Vacuum Breaker Check Valve 571-VAC-CHK-A Camper Trailer Flusher Check Valve fit for b&b Model 571 Check valve Replace Leaking Vacuum Breaker on Black Tank System 1/2 DN Male**Aimery**$28.53**22 rev1y ago](https://www.amazon.com/dp/B0DBR55RH3)

**~~View all new products →~~**

### **Trending**

90-day click momentum

[![ACA RV Vacuum Breaker Check Valve for Black Water Tank Flush](https://m.media-amazon.com/images/I/31w6RSF4xHL.jpg)**ACA RV Vacuum Breaker Check Valve for Black Water Tank Flush**ACA**$13.69**4.1★**▲ 69%**](https://www.amazon.com/dp/B0D66L4BYS) [![RV Vacuum Breaker Check Valve 571-VAC-CHK-A Camper RV Black Tank Check Valve Replace Leaking Vacuum Breaker on Black Tank System Protect Freshwater From Backflow Fix Loud Noise & Wet Floor](https://m.media-amazon.com/images/I/412ql4u6btL.jpg)**RV Vacuum Breaker Check Valve 571-VAC-CHK-A Camper RV Black Tank Check Valve Replace Leaking Vacuum Breaker on Black Tank System Protect Freshwater From Backflow Fix Loud Noise & Wet Floor**MIYIMORE**$17.51**4.0★**▲ 49%**](https://www.amazon.com/dp/B0D3X4TPQH) [![Rogierra RV Vacuum Breaker Check Valve 571-VAC-CHK-A Brass Backflow Preventer for RV Black Tank Flusher System - Fix Leaks Noise & Wet Floor Compatible with Model 571 1/2 Male Thread](https://m.media-amazon.com/images/I/41TZOby2pJL.jpg)**Rogierra RV Vacuum Breaker Check Valve 571-VAC-CHK-A Brass Backflow Preventer for RV Black Tank Flusher System - Fix Leaks Noise & Wet Floor Compatible with Model 571 1/2 Male Thread**Rogierra**$24.92**4.8★**▲ 48%**](https://www.amazon.com/dp/B0FQHFX21C) [![Upgrade 1/2 MPT 571-VAC-CHK-A RV Vacuum Breaker Check Valve for Camper RV Black Tank System Replace b&b Model 571 Check valve 2-Year Warranty](https://m.media-amazon.com/images/I/31la1ZMktQL.jpg)**Upgrade 1/2 MPT 571-VAC-CHK-A RV Vacuum Breaker Check Valve for Camper RV Black Tank System Replace b&b Model 571 Check valve 2-Year Warranty**supeiqality**$16.06**4.0★**▲ 27%**](https://www.amazon.com/dp/B0DHGPNMYQ) [![Dusledel Upgraded 571-VAC-CHK-A Brass RV Vacuum Breaker Check Valve 571 Camper Trailer Flusher Backflow Preventer on Black Tank System Fix Loud Noise & Wet Floor Replace Leaking Improve Freshwater](https://m.media-amazon.com/images/I/41ttskEGZQL.jpg)**Dusledel Upgraded 571-VAC-CHK-A Brass RV Vacuum Breaker Check Valve 571 Camper Trailer Flusher Backflow Preventer on Black Tank System Fix Loud Noise & Wet Floor Replace Leaking Improve Freshwater**Dusledel**$30.13**4.2★**▲ 21%**](https://www.amazon.com/dp/B0D6VBT3K7)

**~~View all trending →~~**

## **Demand & seasonality**

Weekly Amazon search volume, last 101 weeks — +154.5% search growth over the last 90 days.

600400Spike '24Black Friday '24Spike '25Prime Day '25Spike '26 seasonSepDecMarJunAugNovMarMay

Peak months: May, Jun, Jul · busiest ÷ quietest = 4.8×

## **Reviews**

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

### **What buyers love **

**Size-Overall**21%

*“Fit perfect”*

**Advertised Vs Actual Product**14%

*“Worked as it should”*

**Quality-Overall**14%

*“This valve is well made”*

**Assembly/Installation**10%

*“Easy install”*

**Leak-Proof**5%

*“Easy install and no more leak”*

**Efficiency**3%

*“Works great”*

**Design-Overall**3%

*“The product works as designed”*

**Ease Of Cleaning**3%

*“now our black tank clean out works fine”*

**Thickness**3%

*“Perfect fit thick durable material”*

**Filtration**3%

*“Great Check Valve”*

### **What buyers complain about **

**Leak-Proof**46%

*“Leak for valve”*

**Size-Overall**7%

*“Does not fit”*

**Durability**7%

*“Wont last”*

**Quality-Overall**3%

*“Junk”*

**Ease Of Cleaning**3%

*“youll have a mess on your hands”*

**Maintenance And Repair**3%

*“Finding the breaker took more time than replacing”*

**Functionality-Overall**3%

*“didnt work”*

**Jamming/Clogging**2%

*“The previous one was clogged due to a salamander getting inside the line”*

**Material Quality**2%

*“I think it is over plastic”*

**Suction**2%

*“Doesn't fit all types of vacuum breaker fittings”*

### **Top return reasons **

**Leak-Proof**54%

**Size-Overall**15%

**Defective Material/Parts**10%

**Functionality-Overall**5%

**Pressure**4%

**Compatibility-Overall**3%

**Value For Money**2%

**Material Quality**2%

**Noise Level**1%

**Water Resistance**1%