Viessmann O-Ring Set 17.86 x 2.62 (5pcs) 7826215

The Viessmann 7826215 is a five-piece O-ring set for Viessmann Vitodens boilers. It is listed as a supply and return O-ring set and is used to seal the connections where the rings fit. It sits in the O-rings, washers and gaskets range within gas boiler spares.

• Water weeping or dripping at the supply or return connections
• Damp staining or residue around the pipe joints on the boiler
• O-rings that are cracked, flattened, hardened or perished when inspected
• Small leaks that return after the joint has been tightened
• Pressure loss in the system that traces back to a connection seal

• Confirm your boiler model and serial number against the fit list above, as fitment is listed by serial number.
• Measure the existing ring before ordering. The product name lists 17.86 x 2.62, while the catalogue description gives 18mm x 3mm.
• Check which connections the ring seals (supply or return) so the correct position is matched.