WELD-ON 717 GRAY in New Packaging ECO Friendly : Heavy bodied , medium setting , low VOC PVC cement for all classes and schedules with interference fit through 12 #34; (315 mm) diameter (non-pressure applications only up to 18 #34; ). Quality formulation for plumbing, industrial, pool, irrigation and electrical piping systems. It has good gap filling properties and its medium set allows more working time in warm weather.