Heatrae Sadia - Unvented Water Heater Pressure Reducing Valve Pack U195970352 15mm inlet and outlet Important: This product should be used in conjunction with your Water Heater with Pack U2 kit, where the cold water mains supply exceeds 4.1 Bar (60 p.s.i). Compatible with: Heatrae Sadia Heatstore 10 & 15 Litre 3KW Unvented Units Heatrae Sadia Hotflo 10, 15 Litre 2.4KW & 15 Litre 4.5KW Water Heaters Heatrae Sadia Hotflo 30, 50 Litre Water Heaters