R410A adapter is specially designed with a sewing to effectively avoid opening the air conditioning core tube during operation and effectively prevent fluoride leakage. The R410a vacuum pump adapter designed with excellent sealing and extral green gaskets further provide good sealing. The brass converter of the R410a charging vacuum port adapter converts 5/16 inch SAE charging vacuum ports (new style R410a) to accept a 1/4 inch SAE gauge hose. 1/4 Inch Male SAE x 5/16 Inch SAE Adapter. Fits most new R410A mini split air conditioner systems. R410A charging vacuum adapter kit fits most of the latest R410A ductless mini split systems, perfectly suitable for R410a mini split air conditioners, refrigeration and refrigeration systems. for many commercial and industrial refrigeration applications. Our R410a mini vacuum pump adapters are made of premium brass, with solid structure/ and for long-lasting use. Lasts for a long time; easy to use and install, strong sealing for durability and