Check-Flex G5-S0100
Ø 106-113mm L: 190mm
Check-Flex G5-S0100+G
Ø 114-125mm
Check-Flex G5-RESI-S0125
Ø 126-149mm
Check-Flex G5-S Build to Order
Check-Flex G5-S Inline Valve
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Installing a 900mm into a twinwall pipe in a curved-face seawall. Check-Flex G5-S valves have an adjustable clamp set that expands and seals to the pipe wall. The valve is inserted until fully enclosed and then the clamps expanded to create a water seal. Simple to install in a tidal window. The valves can withstand waves without protection.
I saw the new Check Flex Valves this week, they certainly exude quality in build and construction
- Mike - Project Manager, Trunk Sewers and Strategic Pumping, UK
Thank you again for your valuable support—it really makes a difference for the project
- Maria, Design Engineer Denmark
The pipe ID varies between chambers and the stainless steel valve does not fit, the expanding clamp sealed easily to these pipes
- Charlie - Technial Services Engineer, Airport UK

The Check-Flex G5-S inline valve can be installed into angled pipes. The adjustable clamps expand and compress the gasket end to seal to the pipe.

Check-Flex G5-S inline valves fit inside benching. The valve is a little smaller than the pipe ID. Usually fitted to the outlet of a chamber for ease of inspection. Ideal for commercial site installation within property boundary.

Check-Flex G5-S inline valves will seal to lined pipes. Valves are available in any pipe size to ensure optimal performance.
| Model | Style | Pipe Size Range | Pipe Connection | ||||
|---|---|---|---|---|---|---|---|
| -S | -C | -W | -F / -Fi / -Fd | -G | |||
| G5 | Inline Fabricated | 80–3000mm | - | - | - | - | |
| G5M | Inline Moulded | 100–150mm | - | ||||
| G5-RESI | Inline EN13564-1 | 80–200mm | - | ||||
| G4 | Duckbill Fabricated | 100–2400mm | - | - | - | - | - |
| G3 | Duckbill Fabricated | 100–2400mm | - | - | - | - | - |
| G3M | Duckbill Moulded | 100–150mm | - | ||||
| G2 | Inline Duckbill Fabricated | 50–300mm | - | ||||
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.