Foam Pipe Insulation - TOOGOO(R) 6Ft Long Hose 3/4" x 3/8" Air Conditioner Heat Insulation Pipe Black It is widely used for piping heat & cold insulation such as air conditioners in household. Solar energy water piping thermal insulation. Buildings and industries metalized piping and tube insulation. Special insulation and protecting for some small pipes and electrical pipelines.