An olive is a compression fitting used in plumbing. you would use a 22mm olive. you would use t in conjunction with a 22mm compresion fitting Before you use a 22mm olive make sure the pipe you are using the 22m fitting on IS 22mm and NOT 3/4. If it is 3/4 then you need a 3/4 olive from your merchants but they fit inside a 22mm compression fitting.
When one needs more Volume (not pressure)
In the USA, 15mm is half-inch, and 22mm is three-quarters inch. Lengths of pipe nipples in these sizes range from one and a quarter/one and a half, to six inches, in half-inch increments.
If you're asking if they exist. Yes they do. They are usually called Copper (15mm or 22mm) to 7lb Lead. It is called 7lb lead because each yard of copper used to weigh 7lb (pounds). You can get this adaptor but they are quite expensive and comprises of two compression fittings, one each end.
There are 10mm in 1cm so, 22mm = 2.2cm
2.2 cm
0,86 inches
22mm diameter deformed bars unit weight kilogram per meter
22mm = 2.2cm
0.8661 inch
6 cm
22/1 millimetres.