Type N550 Snappy Joe emergency shutoff valves are intended for in-line use on LP-Gas or Anhydrous Ammonia (NH₃) service.

The valves may be installed on both ends of transfer hoses where the hose connects the bulk plant piping to the bobtail, transport, or tank car. They provide a quick way of shutting off gas flow in the event of a hose rupture and meet the requirements for such service when correctly installed with a remote release and proper piping support. Type N550 valves are lever operated, latch-open, and quick closing valves. A fusible element in the latch melts if the temperature reaches 212°F / 100°C, allowing the valve to close.

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