BJ Enterprises TM3 Pneumatic Shut-Off Valve is designed to prevent tank overflows by shutting off the air supply to a pump when its accompanying tank is full. Engineered for use on most single- and double-walled above-ground tanks, the TM3 is primarily used by automotive and industrial markets to help prevent costly and unnecessary tank overflows, with a vertical float design that makes it ideal for tanks with baffles. This unit's polypropylene float can be used in almost any fluid, as it is not affected by oils or most other chemicals, and the fully-pneumatic TM3 contains no electronic parts. With an operating range from 30 to 200 PSI, the easily-installed TM3 is the most dependable air shutoff valve on today's market due to its positive mechanical action, eliminating the use of temperamental diaphragms, and this unit also features an anodized aluminum housing, 3/8" NPT brass air ports, and a machined 2" NPT aluminum bung adapter.