High quality material: High quality ASB material, strong and durable, the sealing surface of the gate and the valve seat are made of rubber, which is resistant to corrosion. 【HIGH QUALITY MATERIALS】High quality ASB material, hard and durable, the sealing surface of the door and seat are made of rubber, it is sturdy, which has the characteristics of high temperature resistance, strength and long service life. High quality ASB material, hard and durable, the door and sealing surface is made of rubber, it is corrosion resistant.