Pipe Joining Couplings

Versatile, durable, and easy to install, Straub mechanical couplings offer the ideal way to join pipes safely and economically. Quick to install and made from non-corrosive materials, Straub couplings can be customized for special applications and used for joining pipes made from different materials.

Available in multiple sizes and styles, Straub products feature an innovative progressive sealing effect that tightens the grip as pressure increases. No welding is required, which means significant installation time savings and no fire watch needed on the job site. Straub couplings have far fewer bolts than flanged connections, which further reduces installation time and headaches. Sealing and anchoring functions are independent in Straub couplings, reducing stress on the components and resulting in flexible connections that can compensate for misalignment and angular deflection.
Get in Touch

Axial Restraint Couplings

Straub-Grip, Metal-Grip, Plast-Grip, and Plast-Pro products use the principle of axial restraint to provide a solid mechanical connection for all metal and rigid plastic pipes. There are countless uses for Straub restraint coupling products due to their universal connection properties. Installation can be performed on smooth-ended pipes without any pipe-end machining. The compact design makes it possible to install Straub couplings in confined spaces. The flexible design of the couplings allows for easy adjustments onsite and enables quick installation that saves time and cuts costs. Available in diameters up to 28” (711mm). Larger sizes available upon request.

Non-Axial Restraint Couplings

Sometimes axial restraint isn’t needed. In these cases, the Straub non-axial restraint coupling offers a flexible connection that can be used to join all types and sizes of pipes, up to 13’ (4m) in diameter. The flexibility of the connection helps with misalignment and angular deflection. The coupling dampens noise and vibration and makes it possible to join pipes made from different materials. The Straub Open Flex, with a hinged casing, can be fitted around pipes to make connections or repairs without removing the existing pipes. When combined with an M11 harness, Straub non-axial restraint couplings provide the same axial restraint capabilities as Straub restraint couplings. Straub Step Flex couplings are also ideal when joining pipes of different diameters – up to 1” (30mm).