The pressure relief valve helps to eleviate pressure build up within a central heating system. It is set to open proportionally to increasing pressure to prevent pressure causing the system to malfunction or break .

• Ideal for Heatrae Sadia Megaflo Cylinder Internal Air Gap
• Ideal for Heatrae Sadia Megaflo Eco Unvented Cylinder
• Ideal for Heatrae Sadia Megaflo Eco System fit Cylinder
• Ideal for Heatrae Sadia MegaFlo Eco SolaReady Unvented Solar Cylinder
• Ideal for Heatrae Sadia Megaflo Eco SystemReady Unvented Cylinder
• Ideal for Heatrae Sadia Megaflo Unvented Cylinder
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• Ideal for Heatstore HSU Unvented Cylinder