Black Flexible PVC hose. Fits PVC Schedule 40 fittings. Just glue hose to PVC Schedule 40 connectors with a special PVC cement. It is very flexible, yet can withstand 50 PSI of pressure and is extremely resistant to freezing winter temperatures. Recommended for high pressure applications, such as large waterfall pumps or connections to upflow filters. This hose will NOT fit barbed hose adapters or hosetails that come with many pond filters and pumps.