Valve Specifications Manufacturer: Vitas Size: 4 in Valve Type: Check Valve Pressure Class: 900 RFFE x RFFE: 12 Units WE x WE: 10 Units Total Available: 22 Units Price is Per Unit Price shown is per individual unit. Twenty-Two (22) total units are available: Twelve (12) RFFE x RFFE and Ten (10) WE x WE. Equipment specifications, materials, trim, end connections, included components, availability, and condition are approximate and subject to verification. Please contact your sales representative for the most current information.