North American Specialty Products (formerly CertainTeed's Pipe & Foundations Group) reported it has enhanced its Yelomine restrained-joint pipe system to carry higher pressures. The entire system—both pipe and joint coupling—is now qualified to 350 psi, using industry-standard testing and pressure rating methodologies.

Yelomine features the proprietary Certa-Lok restrained-joint system, which utilizes precision-machined grooves and a high-strength thermoplastic spline to create a fully circumferential, securely locked restrained joint. The updated system features a stouter spline and a thicker pipe wall. The 350-psi pipe system, available in 4-, 6- and 8-in. (102-, 152- 203-mm) outside diameters, is made of specially modified PVC with average impact values up to five times greater than conventional PVC, is resistant to weather and acids, and won’t rust or corrode. Yelomine also includes ultraviolet inhibitors that allow the pipe to be used in above-ground locations.

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