SIGHT GLASS VALVE is a side valve. It is also called as water gauge. It is a level sensor to check the level. SIGHT GLASS VALVE consists of a transparent tube through which level of liquid or reaction mass inside the reaction kettle can be clearly seen.We UNITED VALVES supply excellent quality of SIGHT GLASS VALVES which are economical and durable. It is attached to the bottom at one end and to the top of the vessel at other end. Both the levels of liquid inside the tank and in the valve are same.