ESV-146 Body Size: 2.9 inches (74 mm); Material: Body: Acrylic resin; Check valve, φ14 Adapter: Olefin elastomer, Drain hose inner diameter φ0.5 inches (14 mm), φ0.6 inches (16 mm); Note: Do not flush with this product except drain water. Remove this product when washing cleaning detergents (drug) During heating and cooling, muddy substances that flow along with drain water can collect in the valves of the silent valve, causing clogging. Check it regularly. If any debris is found inside this product, please clean and remove it immediately. Cannot be stored in the side of the fire or in an impact area. Tilt or landscape use does not meet the functionality of the device, so be sure to install it vertically. Please be careful not to block air holes. The silent valve and drain hose are connected with vinyl tape. (Adhesive cannot be used) After installation, make sure to drain thoroughly from the drain hose terminal.