Description The Vapor Systems Technologies (VST) VDV-EVR-048 Enviro-Loc EVR Balance Venturi Hose 4FT is for Stage II Balance Systems where the gasoline vapors from the fill pipe are pushed back through the outer hose. The hose built-in permanent double swivels offer superior handling and less flex stressing on the hose which translates into longer service life. Key Features Swivel Coupling: Aluminum insert and swivels with high grade Viton seal. UL 330 Listed Hose Assemblies. CARB EVR Certified.1 50 PSI working pressure. 4 ft. long Coaxial Hose.