Corrogated heavy wall vinyl hose with smooth tube. Low permeation for potable water fill, holding tank pump out, bilge, drain, scupper lines and live well use. Hard PVC helix gives exceptional flexibility & bend radius. NOT RECOMMENDED FOR BELOW WATERLINE THRU-HULL CONNECTIONS. No cuffs required but may use #143 RHT cuffs. Operating temperatures +10° to +140°F (-12° to +60°C). 2 YEAR WARRANTY