b&b model 571 check valve
Worth a lookShows demand growing +154.5% this quarter, but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Growth
Incredible+154.5%90-day search growth — must beat 0% to launch
Avg price
Incredible$24.06avg listing price — sweet spot $15–$100
Review moat
Great142.86avg incumbent reviews — the moat a new listing must climb
Price range
Great$13.69–$59.39cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Great11.2%search→purchase rate — share of searches ending in a sale
Quality gap
Good4.3★avg incumbent rating — lower means beatable quality
Returns
Good2.9%return rate — above 5% kills the launch gate
Brand share
Okay80%top-5 brand share — brands hold most of the demand
Competition
Bad75%top-5 click share — a locked-up shelf
Market size
Bad$47K$47K/yr · 17K searches
According to Flapen's Amazon United States niche tracking, b&b model 571 check valve is a $47K/yr Amazon United States market (17K searches/yr). The top 5 brands hold 80% of demand. Demand peaks in May–Jun–Jul. Verdict: Worth a look — 59/100.
Data updated Jul 11, 2026 · scored weekly · How we score niches
b&b model 571 check valve market data
- Units sold / yr
- 2K–3K
- avg 100–250/product
- Revenue / yr
- $48K–$60K
- units × avg price
- Conversion rate
- 11.2%
- Avg BSR
- #289
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 93%
- Out of stock
- 8.2%
- Avg brand age
- 45 months
- Avg seller age
- 202 days
Competition & brand share
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%
Top 20: 100%
Top-5 click share
75%
Top 20: 100%
Open market
16%
- Lisnhlin25%
- RecPro21%
- folosem18%
- NOVINO11%
- Dusledel5%
- MIYIMORE4%
- Open — no brand owns it (7 brands, 16%)
Demand & seasonality
Weekly Amazon search volume, last 101 weeks — +154.5% search growth over the last 90 days.Peak months: May, Jun, Jul · busiest ÷ quietest = 4.8×
Top b&b model 571 check valve search terms
- rv vacuum breaker check valve7K/yr
- b&b model 571 check valve4K/yr
- rv vacuum breaker4K/yr
- rv black tank flush check valve3K/yr
Top b&b model 571 check valve 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.
All 14 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
RecPro RV Vacuum Breaker Check Valve | Protect Fresh Water From Pollutants 571-VAC-CHK-A | Made in America
RecPro$24.964.6★1,039 rev
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$16.794.0★41 rev
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$18.774.1★103 rev
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$28.794.1★66 rev
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$18.494.1★355 rev
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
Rogierra$24.928 rev
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$16.7941 rev
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$16.0630 rev
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$24.8715 rev
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$28.5322 rev
Trending
90-day click momentum
ACA RV Vacuum Breaker Check Valve for Black Water Tank Flush
ACA$13.694.1★
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$17.514.0★
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$24.924.8★
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$16.064.0★
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$30.134.2★
What buyers say about b&b model 571 check valve
What buyers praise and complain about, mined from review topics.What buyers love
“Fit perfect”
“Worked as it should”
“This valve is well made”
“Easy install”
“Easy install and no more leak”
“Works great”
“The product works as designed”
“now our black tank clean out works fine”
“Perfect fit thick durable material”
“Great Check Valve”
What buyers complain about
“Leak for valve”
“Does not fit”
“Wont last”
“Junk”
“youll have a mess on your hands”
“Finding the breaker took more time than replacing”
“didnt work”
“The previous one was clogged due to a salamander getting inside the line”
“I think it is over plastic”
“Doesn't fit all types of vacuum breaker fittings”
Top return reasons
Common questions
- Is b&b model 571 check valve profitable to sell on Amazon United States?
- The niche generates $47K/yr across 14 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +154.5%. Flapen's verdict: Worth a look (59/100).
- How competitive is the b&b model 571 check valve niche?
- 13 brands and 51 sellers compete. The top 5 products take 75% of clicks and top 5 brands hold 80% of demand.
- What do buyers complain about in b&b model 571 check valve?
- Top complaints mined from reviews: Leak-Proof, Size-Overall, Durability. The return rate is 2.9%.
- When does demand for b&b model 571 check valve peak?
- Demand peaks in May–Jun–Jul; the busiest month runs 4.8× the quietest.
- What does it cost to enter the b&b model 571 check valve niche?
- Listings span $13.69–$59.39; the average listing price is $24.06 (sweet spot $15–$100). The average incumbent carries 143 reviews — the moat a new listing must climb.