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Non-Axial Restraint Coupling

Flexible Coupling

The Straub-Flex coupling will join virtually any plain-ended pipe, including pipes made from different materials. Straub-Flex couplings install quickly, safely, and economically and can accommodate pipe system expansion and contraction as well as angular deflection. Straub Open-Flex couplings offer all the Straub-Flex benefits in a split-coupling version that allows for repairs to in-service pipelines. Leaks due to faulty weld joints, pitting holes, and short cracks can be permanently repaired with minimal downtime. The split gasket design, either hinged or with a two-piece casing, wraps around the pipe with no disassembly. Straub’s flexible couplings can be restrained when combined with an M11 harness.

Used for: Non-axial couplings that are suitable for joining and repair of pipes that experience axial movement due to thermal growth and other factors. Available as one-piece or two-piece couplers for all types of materials, up to 144” (3.66m) in diameter. Special sizes are available on request.

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Product Benefits

  • Easy to install
  • Saves time, labor, money
  • Ideal for applications requiring axial movement due to thermal growth or other factors
  • Suitable replacement for expansion joints
  • Eliminates welding. No special tools required
  • Detachable and reusable
  • Joins different pipe materials
  • Flexible connection that compensates for pipe imperfections such as misalignment, angular deflections, ovality, gap and rough surfaces

With more than 50 years of continuous development and improvement, Straub flexible couplings are comprised of premium materials and designed for easy installation, trouble-free service and a long lifespan. Ideal for use in confined spaces and for repairing service lines with minimal disruption. Straub Open-Flex couplings can be installed around pipes without disassembling the pipeline. Fits plain-ended pipes and can join virtually any pipe surface, including steel, stainless steel, ductile iron, FRP, PVC, CPVC, C900, CPP, concrete pipe, copper, CuNi and HDPE (w/ stiffening ring).

Flexible Couplings Selection Info Sheet
Download (XLS 13KB)