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The VJS100 from Spirotherm is a Spirovent Junior Air Eliminator with 1” Sweat inlets. This item 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. It 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". Also equipped with a 1/2" threaded tapping, which allows for easy connection of an expansion tank.