An Advanced Water Gledhill pressure relief valve is to prevent a dangerous build-up of system pressure. They are commonly used in most domestic properties and can be found on boilers and unvented cylinders.
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Technical Specifications
Toilet Cistern CapacityFTW--Supplier Part Number193-475-0004Range DescriptionGledhillBrand NameAdvanced Water
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Advanced Water Gledhill Pressure and Temperature Valve SG001