6mm Brass Compression Coupling supplied complete with olives. Sometimes these are known as compression couplers and are used to create a solid re-usable joint between two pieces of 6mm copper pipe without the need for soldering. (Olives should be replaced when re-making compression joints, an olive removal tool may help in this)
Is recommended not to over-tighten compression fittings when first assembling the joint, however after pressurisation if small leaks are noted the compression fitting can be carefully tightened in place
