Vaillant 981163 Packing Rings

The Vaillant 981163 is a single O-ring from the manufacturer's O-Rings & Lip Seals spare part group. It is a circular elastomer seal that sits in a machined groove and is compressed between two mating faces, closing the joint against water under pressure. It is used within Vaillant water heaters, where it forms part of the sealing arrangement that keeps the appliance working without drips or pressure loss at the joint.

• Dampness, weeping or a visible drip at the joint the ring seals
• The ring looks flattened, hardened, cracked or stretched when the joint is opened
• Scale, sludge or debris sitting in the seal groove or on the mating face
• Repeated pressure loss in the system that needs topping up more often than usual
• Water staining, corrosion or limescale tracking around the joint area

• Match the part number 981163 against the parts list for your appliance before ordering
• Check the model and GC number on the appliance data badge to confirm you have the right unit
• Inspect the seal groove and the mating face for scoring or damage while the joint is open, as a marked face will not seal properly with a new ring
• O-rings are easily nicked or rolled during fitting, so compare the new ring against the one removed before assembly