Expansion vessel and check valve for installations where expansion in the cold main is restricted....Expansion vessel and check valve for installations where expansion in the cold main is restricted. Heatrae Sadia Pack U2 Expansion Vessel Check Valve and Expansion Relief ValveThe Multipoint pack U2 from Heatrae Sadia is an expansion vessel, a check valve and a expansion relief valve. The expansion vessel absorbs the water during use. The check valve prevents backflow and cross contamination of hot and cold water.
Expansion vessel and check valve for installations where expansion in the cold main is restricted. Heatrae Sadia Pack U2 Expansion Vessel Check Valve and Expansion Relief ValveThe Multipoint pack U2 from Heatrae Sadia is an expansion vessel, a check valve and a expansion relief valve. The expansion vessel absorbs the water during use. The check valve prevents backflow and cross contamination of hot and cold water.