Shurflo In-Line Check Valve 340-001, 1/2 Inch Barb, 100 PSI Back Surge Protection

The Shurflo In-Line Check Valve (340-001) is a compact, single-direction water valve built for marine plumbing and water systems where back surge protection matters. It allows water to flow in only one direction, safeguarding pumps, fittings, and fixtures upstream from back surge pressure up to 100 PSI. Its small, low-profile body threads inline with 1/2 inch barb connections on both ends, making it a straightforward addition to an existing hose run without major modification to the plumbing layout.

Construction is plastic, keeping the valve lightweight and corrosion-resistant in the wet, humid environment typical of boat bilges, livewell systems, and freshwater plumbing runs. The small footprint and barb-style ports mean installation is quick: cut into the existing hose line, push the barbed ends into place, and secure with standard hose clamps. Because it is a passive check valve with no moving parts to wire or power, there is nothing to program or maintain beyond periodic inspection of the hose connections.

This valve is a good fit anywhere a boat owner needs to stop backflow in a 1/2 inch barbed water line, such as protecting a pump outlet or preventing siphon-back in a freshwater or livewell fill system. It ships ready to install with no additional hardware required beyond standard hose clamps.

Specifications

• Brand: Shurflo
• Manufacturer Part Number: 340-001
• Port Size: 1/2 inch Barb (13mm)
• Valve Type: Check Valve (one-direction flow only)
• Maximum Operating Pressure: 100 PSI back surge protection
• Material: Plastic
• Number of Ports: 2
• Thread Size: 1/2 inch
• Connector Type: Barb
• Item Dimensions: 2.25 x 4.75 x 6.25 inches
• Weight: 0.2 pounds
• UPC: 752324003341

Frequently Asked Questions

What does the Shurflo In-Line Check Valve 340-001 do? It allows water to flow in only one direction through a 1/2 inch barbed line, safeguarding against back surge pressure up to 100 PSI.

What size hose does the 340-001 check valve fit? The valve has 1/2 inch barb (13mm) ports on both ends, sized for standard 1/2 inch marine water hose.

How much back pressure can this check valve handle? Up to 100 PSI of back surge pressure, which is the maximum operating pressure rating for the Shurflo 340-001.

What is the Shurflo 340-001 check valve made of? It is made of plastic, chosen for its light weight and resistance to corrosion in wet marine environments.

How many ports does this check valve have? The Shurflo In-Line Check Valve has 2 ports, one inlet and one outlet, both sized at 1/2 inch.

What are the dimensions of the 340-001 check valve? The valve measures 2.25 x 4.75 x 6.25 inches.

How much does the Shurflo In-Line Check Valve weigh? It weighs 0.2 pounds.

Is the Shurflo 340-001 check valve easy to install? Yes, its small size and barbed 1/2 inch ports allow for quick, easy inline installation using standard hose clamps.

Does the check valve require power or wiring? No, the 340-001 is a passive mechanical check valve with no moving electrical parts and no wiring required.

What applications is this check valve used for? It is used in marine water systems, such as livewell fill lines and freshwater plumbing runs, to prevent backflow in 1/2 inch barbed hose lines.