The Dixon 3-Way Air Interlock Valve Button Plunger Heavy-Duty Pneumatic is a heavy-duty aluminum pneumatic control component for sequencing tank trailer safety operations. Engineered with high-flow air ports for expedited response times, this 1-inch valve retains the standard 5000AI footprint. It is sealed with durable Baylast™ seals and provides consistent functionality across a thermal profile from -40°F to 158°F (-40°C to 70°C).