The inventive cap comprises a decorative lid, closing and drain sleeves, a cut-off valve and a fixing housing.

The strainer could have a grip enabling its fastening in the run-off bush.

The invention provides a ferrule for use with a ferrule dump socket.

Said drain unit is embodied in the form of a drain bush provided with an annular threaded boss on which a lid having a pipe for evacuating the liquid and nicks formed on the external surface thereof is arranged.

In the second variant of the closing device, an oppositely directed screw thread is embodied on the shell internal surface and on a pouring plug external surface.

In the second variant of the closing device, an oppositely directed screw thread is embodied on the shell internal surface and on a pouring plug external surface.

The inventive cap comprises a decorative lid, closing and drain sleeves, a cut-off valve and a fixing housing.

The flushing fluid is substantially removed from the socket and is replaced with the gas.

The strainer could have a grip enabling its fastening in the run-off bush.

The invention provides a ferrule for use with a ferrule dump socket.

The inventive protective plug comprises a decorative cover provided with a detachable element, a closing sleeve and a drain unit.

Said drain unit is embodied in the form of a drain bush provided with an annular threaded boss on which a lid having a pipe for evacuating the liquid and nicks formed on the external surface thereof is arranged.

The socket defines a socket radius.

In the second variant of the closing device, an oppositely directed screw thread is embodied on the shell internal surface and on a pouring plug external surface.

In the second variant of the closing device, an oppositely directed screw thread is embodied on the shell internal surface and on a pouring plug external surface.