The casing (45) comprises a die with a wall containing at least one cavity (111) for locating a drive part extending through the casing, a first receiving space (112) formed inside the casing for a first clamping piece (80), and a second receiving space formed inside the casing for a second clamping piece, the receiving spaces being located on either side of the cavity. A guide for at least one of the clamping pieces is formed inside the casing and extends transverse to the direction in which the cavity is oriented. A third receiving space is formed inside the casing for a spring (100) and forms an extension of the first and second receiving spaces. Independent claims are also included for the following: (1) Slip coupling for securing a screen inside a greenhouse to a drive member such as a wire, comprising this casing and (2) Greenhouse with screen profiles connected to their drive members via these slip couplings.
