Description The Morrison Bros. 603AAF-1400 AV Truck Tank Emergency Valve Flanged FKM, 3IN provides a safe means of flow control of in the outlet of tank truck compartments. The normally closed valves are opened and closed by compressed air. Key Features Field replaceable Bimba® pneumatic cylinder Redundant (manual override) jackscrew allows product to be released in the event of an air system failure Tapered seat for positive seal 212°F fusible port supplied ⅛″ NPT air ports to accept common size airlines Mates with standard TTMA sumps