PIONEER Air Conditioner Ductless Mini Split System charging vacuum port adapter, Converts new R410a style 5/16 SAE service ports to accept older 1/4 SAE gauge hoses. Converts the 5/16" SAE charging-Vacuum ports to accept 1/4" SAE gauge-hose set Used on most newer R410A Ductless Mini Split Systems Brass construction, with full swivel tip 5/16" Female, 1/4" Male SAE Convenient for any job