1. This kind of double valve fast attachment is composed a mother valve and son vale but they are sealed totally when broken.
2. Using the very precise new mechanical skill manufacture, During the connection or the separation can be guarantee the parent substance and the subfield fluid leak.
3.  You can select the suitable type of the O ring, valve depended on your needs.

• without connection：
  When parent substance's transfers to another end, the stainless steel ball rolls outward, the subfield separates because of the parent substance and under the subfield common valve spring strength's action operation, the subfield and parent substance's valve closed, instantaneous blocks the fluid flow respectively.
• Connection：
  When subfield insertion parent substance, the ferrule in the function of the  spring will back to the original position, the steel ball trundle locking subfield will link closely, simultaneously the parent substance and the subfield valve will impel to open mutually, the fluid circulation, the O circle can block the fluid.

• Selecting the right O ring, vales and seals depended on various chemistry fluid corrosion nature.
• Before the connection, must pay attention to the parent substance to be consistent with the subfield caliber.
• Selecting the appropriate attachment when inner thread connected with the outer thread.