Alpha Pipe Expansion Vessel 6.5625840A

This is the expansion vessel pipe assembly for Alpha gas boilers, supplied under part number 6.5625840A. It carries the connection between the expansion vessel and the boiler's hydraulic circuit, and is listed as a pipe, expansion vessel and seal kit. It is used across the Alpha 240 and 280 appliance families.

• Water weeping or dripping from the pipe connection at the expansion vessel
• Visible corrosion, scaling or pitting on the pipe surface
• Falling system pressure that cannot be traced to any other component
• A hardened, cracked or perished seal at the pipe joint
• Staining or residue around the pipe run indicating a slow, long-standing leak

• Confirm your appliance model and, where shown, its GC number against the fitment list above
• Check the part number 6.5625840A against the manufacturer's parts list for your boiler
• Inspect the existing pipe and seals to confirm the fault lies at this assembly and not elsewhere in the circuit
• Check whether any additional seals or fittings are required for your specific installation