The HYMAX GRIP pipe coupling and flange adapter from Krausz USA is designed to connect plastic and metal pipes (not recommended for asbestos cement or fiberglass pipe). Universal teeth increase grip as pressure is applied.

Made for new piping as well as repair, the coupling and adapter feature the HYMAX hydraulic sealing system that enables joined pipes to move up to 4 degrees on each end of the coupling (up to 8 degrees of deflection).

Mechanical clasps grip the pipe, while hydraulic sealing provides increased sealing force. Flowing water pressure allows dynamic deflection as the restraining element tightens, preventing pipe pullout and future breaks.

Applications include wastewater lift stations, wastewater treatment plants, water treatment plants and wells where restraint is required, says Doug Riseden, technical support manager with Krausz USA.

“In some areas of the United States there’s a lot of ground movement, so being able to restrain that pipe in these applications is very valuable,” he says. “The ground is always moving, so the purpose of this is not only to join the pipe but to restrain it so it won’t pull out.”

Riseden says the coupling is much like the toy finger cuffs of years past: The harder you tried to get out of the finger cuff, the harder it held.

“Ground is shifting all the time, especially during the spring thaw, and that puts a great deal of pressure for pipes to absorb,” he says. “When pipe couplings offer dynamic deflection capabilities, more leaks are going to be prevented farther down the line.”

The coupling restraint has a working pressure of 232 psi and test pressure of 465 psi. Both the coupling restraint and flange adapter have a pipe diameter range of 4 to 12 inches. 855/457-2879; www.krauszusa.com.