The invention is directed to a composition suitable for use in a single-sided stretch cling film, the composition having from 0. A first working pressure duct and a second working pressure duct are formed in the connection block, via which ducts respectively a first and a second working line of the first hydraulic circuit can be connected to respectively a first and a second kidney-shaped control port of a control plate of the hydrostatic piston machine. The communicative portion includes a part of a first surrounding projection formed lower in the height than the other portion of a first surrounding projection of the first cap portion except the communicative portion. This hydrophilic material allows quick absorption of human fluids and turns it into a gelled material.