Introducing the Heatrae Sadia Pack U5 Expansion Vessel and Check Valve—a smart combination designed for optimal performance. The expansion vessel adeptly absorbs water while in use, ensuring seamless operation. Meanwhile, the check valve diligently safeguards against backflow and cross-contamination of hot and cold water, guaranteeing a reliable and safe water system. Experience the convenience and peace of mind with the Hotflo Pack U5 from Heatrae Sadia.