From the product description, check product page for current description, price and availability:

• High Secure: Tubing seats very tightly and will not leak
• This ball lock disconnects are designed for connecting to ball lock Cornelius (Corny) Kegs & Keg Coupler Adapter for homebrewing
• The gray is used for gas (inlet) and the black is used for fluid (outlet)
• Ball Lock Style Quick Disconnects are Used for Most Cornelius, Pepsi Kegs;

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