Check-Flex G2-F Duckbill Check Valve

Inline Duckbill valve for high backpressure rating

Explore the 3D model!
Drag to rotate, scroll to zoom, and click the hotspots to discover more.

Vulcanised and reinforced like a tyre for durability

Flexible and wide seal

Flange drilling to match any mating flange

Sizes to fit all pipes

Encapsulated metal with strong single piece design for marine diffuser applications

Nominal Pipe Size

Check-Flex G2-F0100
OD: 220mm
L: 270mm
H: 94mm

PN6: BCD Ø170mm 4x M16
PN10: BCD Ø180mm 8x M16
PN16: BCD Ø180mm 8x M16
Check-Flex G2-F0150
OD: 285mm
L: 325mm
H: 146mm

PN6: BCD Ø225mm 8x M16
PN10: BCD Ø240mm 8x M20
PN16: BCD Ø240mm 8x M20
Check-Flex G2-F0200
OD: 340mm
L: 380mm
H: 196mm

PN6: BCD Ø280mm 8x M16
PN10: BCD Ø295mm 12x M20
PN16: BCD Ø295mm 12x M20
Check-Flex G2-F0250
OD: 405mm
L: 450mm
H: 246mm

PN6: BCD Ø335mm 12x M16
PN10: BCD Ø350mm 12x M20
PN16: BCD Ø355mm 12x M24
Check-Flex G2-F0300
OD: 460mm
L: 515mm
H: 296mm

PN6: BCD Ø395mm 12x M20
PN10: BCD Ø400mm 12x M20
PN16: BCD Ø410mm 12x M24
Larger sizes built to order
Consider G5-F
Table displaying model, style, pipe size range, and pipe connection options for various products.

We're your trusted experts!

We have decades of extensive experience with rubber check valve application in demanding Atlantic coastal sites. Get design, CAD drawings, specification, installation and troubleshooting advice.

Contact Us
Let's discuss your design
ModelStylePipe Size RangePipe Connection
-S-C-W-F / -Fi / -Fd-G
G5Inline Fabricated80–3000mm----
G5MInline Moulded100–150mm-
G5-RESIInline EN13564-180–200mm-
G4Duckbill Fabricated100–2400mm-----
G3Duckbill Fabricated100–2400mm-----
G3MDuckbill Moulded100–150mm-
G2Inline Duckbill Fabricated50–300mm-