Quick coupling (1; 2) comprising: - a male coupling element comprising at least one tubular portion that comprises an outer surface on which an annular recess is defined; - a female coupling element connectable to said male coupling element and comprising a tubular casing configured to receive at least part of said tubular portion therein; said tubular casing comprising at least one abutting portion and one containing portion spaced apart along an axis of said tubular casing and delimiting an inner annular cavity; - an annular slider that radially outwardly closes said annular cavity and that is axially movable with respect to said tubular casing with the possibility of assuming at least one end stroke position in which it has one disengagement end that is proximal or in contact with said abutting portion and one backward position in which said disengagement end is distant from said abutting portion; said annular slider comprising a first inner surface and a second inner surface that has an inner diameter less than an inner diameter of said first inner surface; said first inner surface comprising at least two annular portions (20a, 20b) arranged on two opposite sides of said second inner surface in axial direction, a first annular portion arranged on one side towards said abutting portion, a second annular portion arranged on one side towards said containing portion; - elastic means arranged to axially push said annular slider towards said end stroke position; - an elastic ring housed in said annular cavity and radially contained by said annular slider; at least one opening being provided on said tubular casing for allowing access from the outside to said disengagement end when said annular slider is in said end stroke position to move said annular slider towards said backward position; there being provided at least one first configuration in which said annular slider is in said end stroke position and said elastic ring is held radially between said second inner surface and said annular recess, at least one second configuration in which said annular slider is in said end stroke position and said elastic ring is radially contained by said second annular portion, and at least one third configuration in which said annular slider is in said backward position and said elastic ring is radially contained by said first annular portion. - a male coupling element comprising at least one tubular portion that comprises an outer surface on which an annular recess is defined; - a female coupling element connectable to said male coupling element and comprising a tubular casing configured to receive at least part of said tubular portion therein; said tubular casing comprising at least one abutting portion and one containing portion spaced apart along an axis of said tubular casing and delimiting an inner annular cavity; - an annular slider that radially outwardly closes said annular cavity and that is axially movable with respect to said tubular casing with the possibility of assuming at least one end stroke position in which it has one disengagement end that is proximal or in contact with said abutting portion and one backward position in which said disengagement end is distant from said abutting portion; said annular slider comprising a first inner surface and a second inner surface that has an inner diameter less than an inner diameter of said first inner surface; said first inner surface comprising at least two annular portions (20a, 20b) arranged on two opposite sides of said second inner surface in axial direction, a first annular portion arranged on one side towards said abutting portion, a second annular portion arranged on one side towards said containing portion; - elastic means arranged to axially push said annular slider towards said end stroke position; - an elastic ring housed in said annular cavity and radially contained by said annular slider;