Our 'Air-King' brand 4-lug Universals can be used for 1-1/4 - 2" water or air to 150psi at ambient temperatures (20°C/70°F). They are NOT for use with steam. We do not recommend crimp sleeves on 1-1/4"-2" 4-lug cast iron Universals, the cast barb design is not compatible with modern crimping technology (use Interlocking Ground Joint Bolt Clamps). Although the manufacturer of Air-King brand permits them for use with air, at New-Line we do not recommend 4-lug Universals for critical applications as they are an older legacy product that is of inadequate design for proper coupling integrity and do not provide a high enough level of safety or reliability - especially in applications subject to pressure and/or temperature. For compressed air in sizes over 1", we recommended to use "Dixon Boss Ground Joints" or "Campbell Viton Seal Ground Joint Couplings" - not 4-Lug Universals. Safety clips & restraints are highly recommended to prevent accidental disconnection, and never disconnect any hose while under pressure.

Warning: <<READ CATALOGUE WARNING!!! Also max temp 20°C/70°F