Guardian PVC and CPVC Double Containment Piping Systems from IPEX by Aliaxis feature Centra-lok molded supports, engineered to average 40 to 60% fewer overall joints and up to 10% fewer field joints compared to conventional containment systems, the company states. Recognizing that pipe joints are the most common source of premature leaks and system failures, IPEX has designed Centra-lok to minimize maintenance, repair and installation costs. The simplicity of the patented Centra-lok design is also intended to offer a cost-effective vinyl-by-vinyl containment system for commercial, industrial, and municipal water and wastewater applications.