Straight Adapters for Refrigerant Charge Hoses, Manometers and Vacuum Pumps. Manufactured in brass. Depressor in all sides Female and valve shells in the sides Male. Option 1: M-1/4 SAE x F-5/16 SAE Fixed Hose Adapter. Option 2: Fixed Hose Adapter M-5/16 SAE x F-1/4 SAE. Facilitate connections and thread transformations from 1/4 to 5/16 or vice versa.