Yellow Jacket 93825 Ritchie Compact Ball Valve For 5/16 Female Flare x 1/4 Male Flare By 1/4 inch ball valves are UL recognized to 4000 psi (276 bar) minimum burst, 800 psi (55 bar) maximum working pressure 5/16 inch for R-410A applications where 5/16 inch system ports are used 5/16 inch are UL recognized to 4000 psi (276 bar) minimum burst, 800 psi (55 bar) maximum working pressure