EK-Quantum Torque Compression Ring 6-Pack HDC 16 - Red is a premium locking ring made for the EK-Quantum Torque HDC 16 series fittings. It is not a stand-alone product, requiring an existing Torque fitting's barb.

EK-Quantum Torque Compression Ring 6-Pack HDC 14 - Green is a premium locking ring made for the EK-Quantum Torque HDC 14 series fittings. It is not a stand-alone product, requiring an existing Torque fitting's barb.

EK-Quantum Torque Color Ring 10-Pack HDC 12 - Green are the interchangeable aesthetic accent rings for EK's new minimalistic 12mm hard-tube compression fittings designed for use with 12mm OD solid tubing such as Acrylic and PETG. They are made of anodized aluminum.

EK-Quantum Torque Color Ring 10-Pack HDC 14 - Green are the interchangeable aesthetic accent rings for EK's new minimalistic 14mm hard-tube compression fittings designed for use with 14mm OD solid tubing such as Acrylic and PETG. They are made of anodized aluminum.