Details EK-Quantum Torque Double Rotary Offset 21 - Black is a premium revolvable male+female threaded 21mm offset adapter fitting with two separate joints, each with its own rotating mechanism. It is commonly used to offset two parallel or perpendicular tubes and is best used on GPU and CPU water blocks to align the tube directly with the distribution plate port. Aesthetically, it perfectly matches the fittings and adapters from the EK-Quantum Torque series. These fittings effectively replace the following three products – the rotaries angled 45 and 90, and a 7 MF extender.