Jandy NeverLube 4716 Two Port Valve 2" - 2-1/2" Positive Seal is designed and engineered to be totally maintenance free. They are easy to install and easy to use. We use the best materials and best design for the ultimate combination of structural integrity and hydraulic flow. The Jandy Pro Series Neverlube Valve 4716 are designed for both 2" and 2-1/2" PVC pipe. The 2" pipe slip fits into the valve ports and the 2-1/2 slips on the outside of the valve ports.