The Bristol series 5453-31G Flow/Differential Liquid Level Controller is part of the Bristol 624-II family of pneumatic instruments. It is designed for performance and durability under rigorous operating conditions. All working parts are made of stainless steel. Diaphragms are made of neoprene and the feedback bellows are Ni-Span-C. The meter body is of rugged, precision die cast aluminum. 

Ideal for applications where non-electric flow and differential liquid level control is required.