Ariston 61308091 O-ring D: 17.86mm X 2.62mm

The Ariston 61308091 is a circular rubber O-ring seal measuring 17.86mm x 2.62mm. It is a service seal used within Ariston boiler and water heater assemblies, where it sits between mating faces to stop water escaping at a joint. Washers, gaskets and O-rings of this type are found in many sections of a boiler, and are commonly needed when components are separated from the pipework for repair or replacement.

• Water weeping or a slow drip at a joint that has been disturbed or resealed
• Damp staining, white crusting or limescale build-up around a pipe or component connection
• A gradual loss of system pressure with no other obvious cause
• The ring looks flattened, hardened, cracked or swollen when the joint is opened
• A joint that will not seal cleanly after reassembly with the old ring in place

• Check the part number 61308091 against the number on the old component or the appliance documentation
• Measure the old ring and compare it with the 17.86mm x 2.62mm dimensions, as similar sizes are used elsewhere in the same appliance
• Confirm whether the job also needs a gasket or seal kit for the surrounding joint
• Isolate the water and power supplies and allow the appliance to drain and cool before opening any joint