Spirovent Jr air eliminator model VJR100 features a patented Spirotube coalescing component, which "filters out" the air from a hydronic or radiant heating system' fluid, allowing for improved performance and extending the lifespan of the heating system's components.Spirovent Jr air eliminator features an easy to install, in-line design, making it ideal for a large variety of residential and light commercial uses with pipe sizes ranging from 3/4" to 1-1/4".Spirovent Jr model VJR100 is also equipped with a 1/2" threaded tapping, which allows for easy connection of an expansion tank.Installation manual included.VJR100 Technical SpecificationsConstruction solid brass constructionConnections 1" threadedMax. operating pressure 150 PSIMax. temperature 270FLiteratureSubmittal Sheet, Dimensional Data, Specs (pdf)Spirovent Jr Spirotrap Brochure (pdf)Installation Manual (pdf)Warranty20 year limited warranty by the manufacturer.