l. The ring is provided with a device to place the jaw regarding the shape of the fitting, improving significantly its resistance to the traction efforts.

2. Double chamber for corrosion prevention. With and special rubber joint placed in the ring, the contact between the three metals of the system is prevented (stainless steel, nickel-plated brass and aluminium) eliminating completely the possibility of water in the inner part of the pipe and water out of the pipe (condensation due to temperature changes, etc) could make contact with the aluminium causing its corrosion.

3. Blockade security system. It facilitates the ring tightening , avoiding the fitting coming out of the pipe during the press fitting operation.

4. Optical checking system for pipe penetration in the inside of the ring before the assembly, avoiding human error. Pipe moves smoothly against the ring placed on the palm of the hand till its limit.