{"product_id":"worcester-greenstar-25si-30si-expansion-vessel-connector-87161133040","title":"Worcester Greenstar 25Si 30Si Expansion Vessel Connector 87161133040","description":"\u003ch1\u003e\u003cspan\u003eWorcester Greenstar 25Si 30Si Boiler Expansion Vessel Connector 87161133040\u003c\/span\u003e\u003c\/h1\u003e\n\u003ch2\u003e\u003cspan\u003eProduct Overview\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eWorcester Bosch Greenstar Expansion Vessel Connector (Part Number: 87161133040)\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a replacement hydraulic connection component designed for selected \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eWorcester Bosch\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e heating systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe connector forms part of the boiler's expansion vessel connection arrangement, providing a connection between the expansion vessel and the sealed central heating circuit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe expansion vessel accommodates changes in heating water volume as the system temperature increases. A correctly fitted connector helps maintain the integrity of the hydraulic connection and supports the expansion vessel's pressure management function.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eℹ️ Product Condition Options:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis part may be available in \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eNew\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e or \u003c\/span\u003e\u003cem\u003e\u003cspan\u003eRefurbished\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e condition. Please select your desired option from the dropdown menu above. Refurbished components should be professionally inspected for damage, wear and leakage before installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eTechnical Insight \u0026amp; Common Failure Symptoms\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe expansion vessel connector is a hydraulic fitting that forms part of the boiler's sealed heating circuit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt provides a connection to the expansion vessel, allowing the vessel to accommodate changes in water volume during heating operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDamage, deterioration or leakage affecting the connector may compromise the integrity of the hydraulic connection and contribute to heating system pressure loss.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePossible signs that the expansion vessel connector or associated components require inspection include:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eWater leakage around the expansion vessel connection.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVisible corrosion or deterioration of the connector.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCracks, deformation or physical damage to the fitting.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDamaged or worn connection surfaces.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eLoose or insecure hydraulic connections.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eHeating system pressure loss associated with leakage.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDamage identified during boiler servicing.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThese symptoms do \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003enot necessarily confirm a faulty expansion vessel connector\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, as similar problems may result from damaged seals, expansion vessel faults or other hydraulic connections. Correct professional diagnosis should be carried out before replacement.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eCompatibility\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThis part (MPN: \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e87161133040\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e) is associated with selected \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eWorcester Bosch Greenstar 25Si and 30Si\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e boiler systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe connector is specified for relevant appliance versions manufactured \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eafter FD787\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlease verify the exact boiler model, GC number, FD production code, part number and connector specifications against the manufacturer's technical documentation before ordering to ensure correct fitment.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eSafety Advice\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003e\u003cspan\u003eBoiler expansion vessel connectors and associated pressurised hydraulic components should only be inspected, removed or installed by a \u003c\/span\u003e\u003c\/em\u003e\u003cstrong\u003e\u003cem\u003e\u003cspan\u003esuitably qualified and competent heating engineer\u003c\/span\u003e\u003c\/em\u003e\u003c\/strong\u003e\u003cem\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cspan\u003eAlways isolate the appliance and allow the heating system to cool before carrying out any work. The heating circuit must be safely isolated and depressurised before removing the connector. Follow the manufacturer's servicing instructions and complete all required pressure, leakage and operational safety checks before returning the boiler to service.\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e","brand":"WORCESTER","offers":[{"title":"New \/ Genuine","offer_id":50527471435879,"sku":"N9590","price":9.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0615\/0923\/8887\/files\/s-l1600_21.webp?v=1792482489","url":"https:\/\/nationalboilerspares.co.uk\/products\/worcester-greenstar-25si-30si-expansion-vessel-connector-87161133040","provider":"National Boiler Spares","version":"1.0","type":"link"}