Manufacturer Name: Trane Product Number: VAL8853 OEM Part Number: VAL8853 The Trane VAL8853 is a 24-volt negative pressure valve specifically designed for commercial and industrial HVAC systems that use natural gas. Measuring about 3/4 inches and weighing around 2.18 pounds, it's a compact component that plays a significant role in safety and efficiency. https://www.partshnc.com/34-24v-negative-pressure-vlv-5