The Calypso exact 1/2" straight valve housing from Imi Hydronic Engineering is a high-quality radiator air vent designed for the efficient venting of heating systems. With a diameter of DN15 and a straight design, this product is ideal for use in fan heaters and other heating devices. The air vent ensures that air bubbles are removed from the heating system, improving the efficiency and performance of the radiators. The item is sold as a single piece and is easy to install. With a width of 1.5 inches, the valve housing offers a compact solution for the demands of modern heating systems. It is an essential accessory for anyone seeking optimal heating performance and wanting to extend the lifespan of their heating devices. Thus, the Calypso exact valve housing is a practical and functional addition to any heating system.