Ideal Sight Glass Gasket 079857

The Ideal 079857 is a sight glass gasket, the sealing ring that sits between the sight glass and its mounting on an Ideal Commercial boiler. It forms a gas-tight and heat-resistant seal around the glass so that the flame can be viewed through the inspection port without combustion products escaping past the glass edge.

This gasket belongs to the Ideal Commercial range of boiler spares and is listed under the Ideal Commercial Boiler Spares brand. It is a service item: the seal is compressed and heat-cycled each time the boiler runs, so it degrades over time and is normally renewed whenever the sight glass is removed or replaced.

• Visible moisture, condensation or staining behind the sight glass
• Water or soot marks tracking around the edge of the glass
• The gasket feels hard, brittle or flattened when the glass is removed
• The gasket has cracked, split or crumbled at the seating face
• Combustion readings or flame picture affected by air leaking past the glass

• Confirm your appliance model and, where available, its GC number against the compatibility list below
• Check the existing gasket against the part number on the old component before fitting
• Inspect the sight glass itself for cracks or clouding, as the glass and gasket are usually renewed together
• Note the alternative number 1175126 when cross-referencing supplier listings