Check-Flex G5-S Inline Valve

Inline Rubber Check Valve with adjustable seal to pipe

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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

Ø 99-105mm L: 190mm
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
Ø 150-154mm L: 255mm
Check-Flex G5-S0150

Ø 156-169mm L: 255mm
Check-Flex G5-S0150+G

Ø 170-175mm L: 255mm
Check-Flex G5-S0170

Ø 176-179mm L: 255mm
Check-Flex G5-S0170+G

Ø 180-184mm L: 255mm
Check-Flex G5-S0180

Ø 185-199mm L: 255mm
Check-Flex G5-S0180+G

Ø 200-206mm L: 306mm
Check-Flex G5-S0200

Ø 207-223mm L: 306mm
Check-Flex G5-S0200+G
Ø 200-206mm L: 306mm
Check-Flex G5-S0200

Ø 207-223mm L: 306mm
Check-Flex G5-S0200+G
Ø 207-223mm L: 306mm
Check-Flex G5-S0200+G

Ø 224-230mm L: 360mm
Check-Flex G5-S0225

Ø 231-236mm L: 360mm
Check-Flex G5-S0225+G

Ø 237-243mm L: 360mm
Check-Flex G5-S0237

Ø 244-248mm L: 360mm
Check-Flex G5-S0237+G
Ø 249-255mm L: 370mm
Check-Flex G5-S0250

Ø 256-259mm L: 370mm
Check-Flex G5-S0250+G

Ø 260-265mm L: 370mm
Check-Flex G5-S0260

Ø 266-274mm L: 370mm
Check-Flex G5-S0260+G

Ø 275-282mm L: 440mm
Check-Flex G5-S0275

Ø 283-291mm L: 440mm
Check-Flex G5-S0275+G

Ø 292-298mm L: 460mm
Check-Flex G5-S0292
Ø 292-298mm L: 460mm
Check-Flex G5-S0292

Ø 298-304mm L: 460mm
Check-Flex G5-S0300

Ø 305-347mm L: 460mm
Check-Flex G5-S0300+G

Ø 348-356mm L: 540mm
Check-Flex G5-S0350

Ø 357-369mm L: 540mm
Check-Flex G5-S0350+G
Ø 370-380mm L: 560mm
Check-Flex G5-S0375

Ø 381-397mm L: 560mm
Check-Flex G5-S0375+G
Ø 398-405mm L: 570mm
Check-Flex G5-S0400

Ø 406-444mm L: 570mm
Check-Flex G5-S0400+G
Ø 445-455mm L: 580mm
Check-Flex G5-S0450

Ø 456-495mm L: 580mm
Check-Flex G5-S0450+G
Ø 496-506mm L: 720mm
Check-Flex G5-S0500

Ø 507-517mm L: 720mm
Check-Flex G5-S0500+G
Ø 518-527mm L: 720mm
Check-Flex G5-S0525

Ø 528-564mm L: 720mm
Check-Flex G5-S0525+G

Ø 565-574mm L: 905mm
Check-Flex G5-S0565

Ø 575-594mm L: 905mm
Check-Flex G5-S0565+G
Ø 595-605mm L: 920mm
Check-Flex G5-S0600

Ø 606-667mm L: 920mm
Check-Flex G5-S0600+G

Ø 668-680mm L: 1100mm
Check-Flex G5-S0675

Ø 681-698mm L: 1100mm
Check-Flex G5-S0675+G
Ø 668-680mm L: 1100mm
Check-Flex G5-S0675

Ø 681-698mm L: 1100mm
Check-Flex G5-S0675+G
Ø 699-742mm L: 1100mm
Check-Flex G5-S0700+G

Ø 743-752mm L: 1120mm
Check-Flex G5-S0750

Ø 753-791mm L: 1120mm
Check-Flex G5-S0750+G
Ø 743-752mm L: 1120mm
Check-Flex G5-S0750

Ø 753-791mm L: 1120mm
Check-Flex G5-S0750+G
Ø 792-805mm L: 1190mm
Check-Flex G5-S0800

Ø 806-890mm L: 1190mm
Check-Flex G5-S0800+G
Ø 891-904mm L: 1320mm
Check-Flex G5-S0900

Ø 905-981mm L: 1320mm
Check-Flex G5-S0900+G
IØ 982-1002mm L: 1420mm
Check-Flex G5-S1000

Ø 1003-1036mm L: 1420mm
Check-Flex G5-S1000+G
Ø 1037-1056mm L: 1540mm
Check-Flex G5-S1050

Ø 1057-1090mm L: 1540mm
Check-Flex G5-S1050+G
Ø 1091-1109mm L: 1550mm
Check-Flex G5-S1100

Ø 1110-1188mm L: 1550mm
Check-Flex G5-S1100+G
Ø 1189-1220mm L: 1740mm
Check-Flex G5-S1200
Built to Order
Table displaying model, style, pipe size range, and pipe connection options for various products.

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

A worker in a hard hat and high-vis vest stands in a trench next to a large pipe being lowered.

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.

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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-