This Baxi Multifit Pitched Roof Boiler Flue Flashing is a genuine part designed for use with vertical flue terminals. It is suitable for 25°/50° angles and has a diameter of 125mm. The Multifit Gas Saver, which this flashing is part of, is an innovative product that sits between a boiler and flue, recycling heat from flue gases that would normally be wasted. It is black in colour.