Worcester Bosch Drain Valve 87174051630

The Worcester Bosch 87174051630 is a drain valve used on Greenstar gas appliances. It provides a controlled point at which the water in the heating circuit can be emptied, so an engineer can drain down the system for repair, component replacement or flushing without disconnecting pipework elsewhere. It is a serviceable item and is supplied as a spare for the Greenstar range.

• Water weeping or dripping from the drain point when the valve is closed
• The valve spindle will not turn, or turns without operating the valve
• Scale or corrosion around the outlet, with a visible crust or staining
• The system cannot be drained down fully, or drains only slowly
• A persistent damp patch beneath the appliance after the system has been refilled

• Check the GC number on the appliance data badge against the compatibility list before ordering
• Confirm the model and serial number, as Greenstar variants can differ in their drain arrangements
• Check whether a sealing washer or gasket is required with the valve, as these are often replaced at the same time
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.