Oatey® PVC Heavy Duty Medium Set Gray Cement is recommended for DWV, pressure pipe, potable water and electrical applications. Its thick formula fills gaps in large diameter pipe and fitting joints and is easy to apply. This gray, heavy duty, medium set cement can be used to solvent weld all schedules and classes of PVC pipe and fittings with interference fit up to 18 in. diameter for non-pressure and 12 in. diameter for pressure pipes. Oatey products have earned the trust of plumbing professionals for over 100 years.