Often referred to as a "fire valve." Used to shut off flow in the event of fire. Fusible link holds the open spring actuated lever. Body mounts at the base of an aboveground tank with plunger end projecting inside the tank, this the designation "internal. Brass body and brass internals, Viton O-ring. Threaded mounting connection. Also available with shear section machined in body, locking lugs for padlock, or both.
- Adjustable hold open mechanism
- 212° UL listed fusible link
- Shear section model provides added impact protection
- Locking model for added theft protection