Description Westlake Pipe & Fittings C900/RJIB Certa-Lok® PVC Pressure Pipe is manufactured to meet the standards of today’s municipal needs for water and wastewater pressure applications. This unique integral bell restrained joint pipe system is designed for trenchless applications with robust tensile strength for pulling multiple segments underground. The smooth curve at the bell specifically reduces friction and allows for quick and easy assembly without interrupting the pulling process.