Worcester Bosch Siphon Cap 87161138420

The Worcester Bosch 87161138420 is a siphon cap that forms part of the condensate assembly on Worcester Bosch Greenstar i System boilers. It closes the condensate trap and siphon, holding the water seal that prevents flue gases from passing back through the condensate discharge route. As a serviceable component it can be renewed on its own when the cap is damaged, distorted or no longer sealing correctly.

• Water pooling around the condensate trap or on the surface beneath the boiler
• Dripping or weeping from the cap during running or after shutdown
• Condensate backing up in the trap, with gurgling or intermittent lockout
• Visible cracking, distortion or hardening of the cap material
• A damp or acidic smell close to the condensate discharge point

• Check the GC number on the appliance data badge against the compatibility list before ordering.
• Quote the alternative number 1021943 if your records use it.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
• Inspect the trap seals and gaskets while the cap is off, and renew them if they are perished or marked.