Immersion Heater Back Nut 95607869 / 95606963 Compatible with: Heatrae Sadia Amptec Electromax Combination Cylinders and Boilers Heatrae Sadia Megaflo Unvented Cylinders Heatrae Sadia Megaflo Eco Unvented Cylinders Heatrae Sadia Megaflo HE Unvented Cylinders Heatrae Sadia Megaflo HE Unvented Mark 1, 2 & 3 Control Cylinders Heatrae Sadia Megalife Solar Cylinders Heatrae Sadia Megatech Solar Cylinders Santon Premier Plus (MK1 Control) Cylinders Santon PremierPlus Solar Cylinders