Ariston O-Ring 65153932

The Ariston 65153932 is an O-ring seal used across Ariston heating and hot water appliances. It sits in a machined groove at a joint between two components and is compressed when the joint is tightened, forming a watertight barrier that stops water escaping past the connection. O-rings are consumable items: heat, pressure cycling and limescale gradually harden and flatten the rubber until the seal no longer recovers its shape.

• Water weeping or a visible drip at a joint that was previously dry
• Damp staining, corrosion or white scale trails around a connection
• The O-ring feels hard, brittle or flattened rather than pliable
• Cracks, nicks or a squared-off cross section when the seal is removed
• A joint that continues to seep after being re-tightened

• Confirm the part number 65153932 against your appliance's parts listing, as O-rings of similar diameter are not interchangeable across assemblies.
• Check whether the joint also uses a gasket or seal kit, since these are often renewed at the same time as the O-ring.
• Note the alternative number 1593159 so you can cross-check against older documentation.