Dixon Valve Air Chief industrial interchange quick-connect fitting. Application: Air Chief industrial quick-connect couplers are the popular Industrial Interchange design and will interchange with many other makes. Couplers shut-off when disconnected. Rated to 300 psi. For air service only. Interchanges with MIL Specification MIL-C-4109F/A-A-59439. Temperature range: -40 degrees F to 250 degrees F.