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.
- Housing – Ductile Iron, ASTM A536
- Grip ring – Ductile Iron, ASTM A536
- Bolt and nut – Type 304 Stainless Steel
Suggested Specifications: Joint Restraint shall be knuckle type as manufactured by HARCO (Harrington Corporation) of Lynchburg, Virginia. The grip ring shall be one piece residing within a ductile iron housing having machined serrations and shall be activated by one bolt. Housing and grip ring shall be of ductile iron to ASTM A536. Bolt and nut shall be Type 304 stainless steel.