R410a adapter charging vacuum port adapter brass converter with thimble 5/16 inch female quick couplers to 1/4 inch male flare for mini split system Features: Brass construction, quick connect, good tensile strength, resisting corrosion. Come with full swivel tip. With straight angle on the service port site for easier access. Function: Converts the 5/16 inch charging vacuum ports to accept 1/4 inch gauge-hose set. Application: Ideal fits for R410a mini split system air conditioners, HVAC and refrigeration service. Specifications: Material: brass Connectors: 5/16 inch female to 1/4 inch male valve core depressor Thread diameter: 0.47 inch/ 12 mm Thread size: 11 mm Total size: diameter: 0.63 inch/ 1.6 cm, 2.09 inch/ 5.3 cm Please note: R410A ductless mini split systems are usually equipped with a different charging port size to avoid charging of wrong refrigerant into the system (i. E. R22) This new port size is 5/16 inch and some gauge sets carry 1/4 inch connectors. Port adapter converts the 5/16 inch ports to use with 1/4 inch gauge sets.