Heatrae Sadia - 3/4 Nut/Olive Pack 95607838 Compatible with: Heatrae Sadia Megaflo Unvented Cylinders Heatrae Sadia Megaflo Eco Unvented Cylinder Heatrae Sadia MegaFlo Eco SolaReady Unvented Solar Cylinder Heatrae Sadia Megaflo Eco SystemReady Unvented Cylinder Heatrae Sadia Megatech Solar Cylinder Heatrae Sadia Sapphire