check valve
Skip itA small market ($76K/yr) — this niche doesn't clear our bar today.
Returns
Good2.4%return rate — above 6% kills the launch gate
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Conversion
Okay3.7%search→purchase rate — share of searches ending in a sale
Brand share
Okay77%top-5 brand share — brands hold most of the demand
Review moat
Okay2,091.93avg incumbent reviews — the moat a new listing must climb
Price range
Okay$4.15–$20.77cheapest to priciest tracked listing — scored on the share inside $15–$100
Growth
Okay+6.3%90-day search growth — must beat 0% to launch
Competition
Okay66%top-5 click share — leaders hold, buyers still browse
Avg price
Okay$9.76avg listing price — sweet spot $15–$100
Market size
Bad$76K$76K/yr · 211K searches
According to Flapen's Amazon United States niche tracking, check valve is a $76K/yr Amazon United States market (211K searches/yr). The top 5 brands hold 77% of demand. Verdict: Skip it — 38/100.
Data updated Jul 17, 2026 · scored weekly · How we score niches
check valve market data
- Units sold / yr
- 8K–10K
- avg 500–750/product
- Revenue / yr
- $78K–$98K
- units × avg price
- Launch success
- —
- 0 of 0 new (360d)
- Conversion rate
- 3.7%
- Avg BSR
- #45
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 93%
- Out of stock
- 0.0%
- Avg brand age
- 52 months
- Avg seller age
- 169 days
Competition & brand share
The top 5 products take 66% of clicks — established leaders, but buyers still shop beyond them.Brands
11 falling
Sellers
23
Top-5 brand share
77%
Top 20: 100%
Top-5 click share
66%
Top 20: 100%
Open market
17%
- Pawfly50%
- Blulu7%
- PumpSpy7%
- AQUANEAT7%
- Uenede6%
- DaToo6%
- Open — no brand owns it (5 brands, 17%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — +6.3% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.4×
Top check valve search terms
- check valve75K/yr
- check valves35K/yr
- one way valve16K/yr
- aquarium check valve15K/yr
- check valve aquarium15K/yr
- air check valve10K/yr
- one way air valve10K/yr
- one way check valve9K/yr
- water check valve6K/yr
- pvc check valve7K/yr
Top 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
Pawfly 6 PCS Aquarium Check Valves for Common Air Pumps Red Plastic 1-Way Non-Return Valves Pump Protectors for Standard 3/16 Inch Airline Tubing Fish Tank Accessories for Aeration Setup
Pawfly$5.024.5★5,502 rev
6 Pieces One Way Inline Check Valve Bulk 3/8 Inch 10 mm ABS Plug-in Non Return Check Valve Fuel Water Gas Air Ozone Pipe One-way for Liquids and Gas
Blulu$9.004.5★369 rev
PumpSpy Silent Check Valve - 1-1/2 with Buna-N Couplings Model CV-150 Spring-Loaded Flapper Sump Pump Life Expectancy Increase Includes Steel Clamps Fit 1-1/2 Pipe
PumpSpy$20.774.7★2,001 rev
AQUANEAT Aquarium Check Valve One Way Non Return Valve for Air Pump Fit for 3/16 Inch Airline Tubing Fish Tank Accessories 10pcs (Red)
AQUANEAT$4.674.4★905 rev
Uenede Solid Brass 3/4 Inch In-line Spring Check Valve 3/4 NPT Female Thread One-Way Non-return Prevent Water Back-flow
Uenede$11.034.5★135 rev
Newest
by launch date
ChillWaves 304 Stainless Steel In-Line Siamese Check Valve 1/4 NPT Male x 1/4 NPT Female Thread One-Way Non-return Check Valve for Backflow Prevention(1-PACK)
ChillWaves$14.84128 rev
DaToo Aquarium Air Pump Check Valve 12PCS Fish Tank One Way Non-Return Check Valve Air Pump Accessories for 3/16 Inch Airline Tubing
DaToo$4.15170 rev
Pawfly Aquarium Check Valves for Common Air Pumps Black Plastic 1-Way Non-Return Valves Pump Protectors for Standard 3/16 Inch Airline Tubing Fish Tank Accessories for Aeration Setup 6 Pack
Pawfly$5.005,502 rev
Uenede Solid Brass 3/4 Inch In-line Spring Check Valve 3/4 NPT Female Thread One-Way Non-return Prevent Water Back-flow
Uenede$11.03135 rev
Litoexpe 1/2 One Way Inline Check Valve Non Return Ozone Resistance PVDF Plastic One-Way Fuel Oil Water Gas Pump Air Check Valve Pack of 2
Litoexpe$6.75258 rev
Trending
90-day click momentumChillWaves 304 Stainless Steel In-Line Siamese Check Valve 1/4 NPT Male x 1/4 NPT Female Thread One-Way Non-return Check Valve for Backflow Prevention(1-PACK)
ChillWaves$14.844.2★
Uenede Solid Brass 3/4 Inch In-line Spring Check Valve 3/4 NPT Female Thread One-Way Non-return Prevent Water Back-flow
Uenede$11.034.5★
Merrill MFG CVNL100 1 No-Lead Brass Check Valve 700 Series 1
Merrill$19.864.7★
Pawfly Aquarium Check Valves for Common Air Pumps Black Plastic 1-Way Non-Return Valves Pump Protectors for Standard 3/16 Inch Airline Tubing Fish Tank Accessories for Aeration Setup 6 Pack
Pawfly$5.004.5★
Homewerks VCKP40E5B PVC Schedule 40 1-Inch in-Line Check Valve x Solvent 1 Inch White
Homewerks Worldwide$10.514.4★
What buyers say about check valve
What buyers praise and complain about, mined from review topics.What buyers love
“Good quality”
“Works as advertised”
“Easy Install”
“QUIET”
“Good Value Multipack”
“Direct fit”
“Works great”
“Brass check valve fir well water pressure tank”
“Great replacement part for leaking Chili Dock Pro”
“Simple stuff”
What buyers complain about
“through process of elimination i discovered it was the check valve leaking gas”
“4 Out of 6 Didn't Work”
“Won't last long”
“but it is pretty loud when the pump starts”
“More like 15PSI drop in pressure”
“Worked for less than 2 months when the rubber check inside it degraded so much that it blocked the line”
“Expensive junk”
“Already jammed open”
“Disappointed flow through with minimal loss pressure”
“stinking up the garage”
Top return reasons
Common questions
- Is check valve profitable to sell on Amazon United States?
- The niche generates $76K/yr across 14 tracked products. 90-day search growth is +6.3%. Flapen's verdict: Skip it (38/100).
- How competitive is the check valve niche?
- 11 brands and 23 sellers compete. The top 5 products take 66% of clicks and top 5 brands hold 77% of demand.
- What do buyers complain about in check valve?
- Top complaints mined from reviews: Leak-Proof, Functionality-Overall, Durability. The return rate is 2.4%.
- When does demand for check valve peak?
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- What does it cost to enter the check valve niche?
- Listings span $4.15–$20.77; the average listing price is $9.76 (sweet spot $15–$100). The average incumbent carries 2,092 reviews — the moat a new listing must climb.