Restraint Coupling

May 15, 2020
HYMAX GRIP Cut-in Sleeve

The HYMAX GRIP Cut-in Sleeve (3”–12”) is a unique restraint coupling designed to connect valves and hydrants or existing lines with a mechanical joint connection. Made from ductile iron, it’s the first transition coupling that can connect to a mechanical joint while restraining the connecting plain pipe with only one bolt to tighten. The HYMAX GRIP technology allows the connecting plain-end pipe to be adjusted as needed, saving time on cutting and installing extra pipe.

The HYMAX GRIP Cut-in Sleeve has a wide working range for connecting pipes of different diameters and replaces the need to use dedicated-sized transition couplings to help reduce inventory costs and save shelf-space. The restraint coupling has patented universal gripping teeth for both plastic and metal pipes. The GRIP chain offers circular restraint around the pipe, unlike typical wedge-style restraints that point-load the pipe and make it weaker. The GRIP’s radial closing mechanism holds pipes tightly in place during installation, allowing full control over the gap between pipes. As the pipe applies axial pressure, the GRIP chain increasingly tightens over the pipe, preventing pullout.

The HYMAX GRIP Cut-in Sleeve allows dynamic deflection of the pipe for up to four degrees per side, reducing future pipe cracks and breaks. By installing the product, installers are effectively transforming the pipe into a flexible connection that can help save on repeated repair costs. With a reduced number of bolts and its lightweight design, the HYMAX GRIP Cut-in Sleeve makes repairs safer and faster with less time spent in the ditch. WW

Krausz is exhibiting at ACE20, booth 5000. Learn more at

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