The optional connection terminal provides expanded connection options. It allows the current HEATKILLER V coolers of the ASUS RTX 5090 TUF graphics cards to be connected to the side of the circuit.Technical data:Material: AcetalConnection: 2 x G ¼ inch (DIN ISO 228-1)Compatible with:HEATKILLER® V PRO for ASUS RTX 5090 Cooler