With features and specifications uniquely suited to Horizontal Directional Drilling and Static Pipe Bursting applications, Certa-Flo™ restrained-joint PVC pipe is an ideal product choice for municipal sewer system repair projects as well as new construction. Certa-Flo delivers exceptional value, from fast and easy installation through long, dependable service life. Certa-Flo pipe provides a restrained joint by utilizing precision-machined grooves on the pipe and in the integral bell which, when aligned, allow a spline to be inserted, resulting in a fully circumferential restrained joint that locks the pipes together. A flexible elastomeric gasket in the integral bell provides a hydraulic seal.