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grip type coupling for pvc pipe

Straub Axial Restraint Couplings for PVC Pipe

Straub restraint couplings absorb the axial forces from increasing internal pressure with an innovative mechanical frictional connection comprised of anchoring teeth. As the internal pressure increases, the teeth engage deeper into the pipe surface, creating the restraint connection. Whether for pressure or suction lines, thin or thick-walled pipe, Straub restraint couplings install quickly, safely and economically.

Used for: Pull-out resistant couplings use a grip ring to join all types of PVC pipes from ¾” to 28” diameter (27mm to 711mm)

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Product Benefits

  • Works with plain-end pipe connections
  • No welding required, saving time and labor
  • Universal connection for multiple types of pipe
  • Prevents axial movement of the pipe
  • Quick and easy installation
  • Flexible connection compensates for misalignment and angular deflection
  • Innovative progressive gripping system – the higher the pressure, the tighter the grip
  • Available in sizes up to 12” (304mm) diameter

With more than 50 years of continuous development and improvement, Straub restraint couplings are comprised of premium materials and designed for easy installation, trouble-free service and a long lifespan. Straub’s patented progressive sealing effect increases the grip on the pipe as the pressure inside the pipe increases, creating a robust and reliable connection.

The maximum temperature for using GRIP couplings on PVC pipe is 86°F (30°C). Aquarise couplings are used for temperatures above this for sizes up to 6” (152mm) in outside diameter. Please contact your local Straub sales representative for more information.

Related Straub Coupling Products for Your Piping Needs

Hamilton Kent’s versatile coupling solutions cover a wide range of piping materials and demanding conditions. For concrete pipelines, the Straub Concrete Coupling offers a strong, weld-free connection. For metal piping, our steel and stainless steel restraint couplings provide reliable axial restraint, while our ductile and cast iron restraint couplings deliver durability and strength in challenging environments.

In marine applications, Hamilton Kent’s product range includes the marine restraint coupling and flexible marine couplings designed for offshore conditions.

For repairs and maintenance, repair coupling clamps and flex repair couplings provide fast, effective fixes to restore pipeline integrity. When axial restraint is not needed, the non-axial restraint coupling offers a flexible, secure alternative. The HK test coupling facilitates easy pressure testing and temporary connections.


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