What is hard tubing compression fitting: Fittings for hard tubing are marked with only one number, which stands for the OD (Outer Diameter) of the tube it can accommodate. A hard tubing compression fitting consists of more parts, but the two most important are the base and the locking ring. The hard tubing compression fitting usually also has two more o-rings. One is nested inside the base of the fitting, while the other one sits between the base and the locking ring. The most common sizes for hard tubing compression fittings are for 12mm, 14mm and 16mm tubes that Dracaena offers.Advantages of tubing: Compression fittings are popular because they do not require soldering, so they are comparatively quick and easy to use. They require no special tools or skills to operate. They work at higher pressures and with toxic gases. Compression fittings are especially useful in installations that may require occasional disassembly or partial removal for maintenance etc., since these joints can be broken and remade without affecting the integrity of the joint.They are also used in situations where a heat source, in particular a soldering torch, is prohibited, or where it is difficult to remove remains of water from inside the pipe which prevent the pipe heating up to allow soldering.Dracaena Compression fitting: Dracaena fitting is perfectly designed for anti-off function. It prevents any leaking, slipping from the tubes. With the Fixing method which is known as Hexagonal M8 fixed (tool please search for “wrench” in the store) and built-in silicone sleeve sealing method, the product is advanced compared with other fittings. Surface is treated with electroplating also brings the best visualization for your design