heavy duty gray cement for use on all schedules and classes PVC pipe and fittings up to 12 in Dia with interference fit, up to 18 in for non-pressure. Low VOC solvent cement meets California south coast air quality management district 1168/316A or BAAQMD Method 40 and various environmental requirements. Thick formula fills gaps in large diameter pipe and loose fitting joints. Recommended for potable water, pressure pipe, conduit and DWV.