The Harrington Corporation - 4" Knuckle Restraint

The Harrington Corporation - 4" Knuckle Restraint
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The Harrington Corporation - 4" Knuckle Restraint

SKU: 60-100-04
  • Easy to Install
  • Handled as One Unit
  • One-Bolt Actuation
  • Machined Grip ring Serrations
  • Economical

The Knuckle Joint Restraint by HARCO provides an easy to use, economical option for thrust restraint of HARCO small diameter push-on ductile iron fittings for IPS-PVC pipe.
The unique, two-piece design handles as one piece and permits a one-bolt actuation. The restraint is mounted on the fittings so that the bolt is accessed from the top, making for ease of installation and inspection. Mechanical serrations in the grip ring assure proper gripping of the pipe. No restraint rods or bolts are required.
Once the Knuckle Restraint is mounted, simply push home the beveled PVC pipe, having applied pipe lube to the gasket and pipe spigot. Tighten the bolt that clamps the grip ring onto the pipe and the joint is securely restrained.

  • All Fittings Meet or Exceed: 
  • Materials: ASTM A-536
  • Bolt & Nut: Stainless Steel Type 304
  • Coating: AWWA C-153

Knuckle bolt torque: 35 ft-lbs.