Alpha O-Ring 2.9mm x 1.78mm 1.022358

The Alpha 1.022358 is a small rubber O-ring with a 2.9mm outside dimension and 1.78mm cross-section. It is used as a sealing component on Alpha E-TEC heat pump and hybrid appliance assemblies, where it seats between mating faces to prevent water loss at the joint. Sealing performance depends on the ring sitting correctly in its groove and being compressed evenly when the joint is tightened.

• Visible water weeping or a damp trace around the joint the O-ring seals
• The ring has hardened, flattened or lost its round cross-section
• Cracking, splitting or surface perishing visible on inspection
• The ring has been disturbed during servicing and no longer seats cleanly in its groove
• Scale or debris embedded in the rubber preventing a clean seal

• Confirm the appliance model against the fitment list above
• Check the existing O-ring dimensions match 2.9mm x 1.78mm before ordering
• Inspect the groove and mating faces for corrosion, scale or scoring that could prevent a seal
• Check whether any other seals on the same joint also need attention