Useful Adapter: Converts the 5/16inch SAE charging-Vacuum ports ( R410a style) to accept 1/4inch SAE gauge-hose set. 1/4inch Male SAE x 5/16inch SAE Female Adapter. Manufacture Standard: Meets SAE, EPA and UL requirements for containment of refrigerant. Well-Designed Valve: This connector has a thimble, in the course of the operation, it not open the air conditioning core tube, completely solve the problem of fluoride leakage injury, security is guaranteed. The coupler nuts are deeply knurled for quick finger-tightening. Wide Application: Used on most newer R410A Ductless Mini Split Systems. Perfectly fits for R410a mini split system air conditioners, HVAC and refrigeration service Premium Quality Adapter Sets: Made by Brass Alloy, last long; Easy to operate and install, strong sealing for durability and safety. colour: yellow Material:metal size: 5cm Package Contents: 2 x connectors Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.