





🔧 Flow forward, never back—engineered for the pros who demand reliability.
The Quickun 5/16" One Way Inline Check Valve is a spring-loaded, corrosion-resistant valve designed to ensure unidirectional flow and prevent backflow in fuel, oil, water, gas, and air systems. Made from durable PVDF plastic, it offers chemical and moisture resistance, easy tool-free installation, and is ideal for industrial and commercial applications including hydraulic and pneumatic systems, irrigation, and pool filters. Sold as a convenient 2-pack for versatile use.






| Manufacturer | Quickun |
| Part Number | 1-2120-valve-2pcs |
| Item Weight | 0.352 ounces |
| Package Dimensions | 2.32 x 1.38 x 0.91 inches |
| Item model number | 2.00 |
| Size | 5/16" |
| Material | Plastic, Rubber |
| Batteries Included? | No |
| Batteries Required? | No |
B**A
1 way valve works great!
Works great to seal off airbed pump tubing on double mattress, queen size completely!
J**D
Intended for a bit higher pressure than what i needed
These valves take a bit of pressure to open. they were not as sensitive to opening pressure as i needed. but they are quality pieces.
N**L
In line filter
Good
L**Y
good
good
J**
Junk- Do Not Buy
Absolute junk. Don't waste your time or money. First one I used worked for 2 hours then started dribbling. I tapped it a few times and it worked for a few more minutes. Swapped it with the second one, started dribbling right away. No Good
S**N
good quality. Works great
work great for dehumidifier pumping to drain. Keeps water from back feeding
C**.
They're ok
These work for the purpose of preventing back flow. They are however extremely difficult to insert even with a heat gun. And they tend to prevent forward flow just as much as back flow if you don't have amazing pressure.
T**
Great value
Nice super small check valve, perfect for what I needed it for.
Trustpilot
1 month ago
3 weeks ago