Abstract: A ladder of the kind which comprises two elongated and vertically extending, rigid uprights, having axially extending recesses. A rung is provided having apertures defined by sleeves having uninterrupted inner surfaces, for receiving therethrough the uprights. An elongated split sleeve is provided having a protrusion on an inner edge for engaging with the axially extending recess of the upright. The split sleeve slides around and is coaxially aligned with the rigid upright. The arrangement of the ladder is simple to assemble, having few parts, which fit together without requiring additional bolting or securing.

Abstract: This installation allows the drive pump (16) to be connected directly to the main housing (1) of the installation, or remotely from said housing; it is provided with a simplified structure and comprises the removable assembly of a closed handgrip (35), for the user, which is attached to a strong base plate (27) intermediate the front surface (14) of the main housing (1) and a lightweight face plate (34). The pump (16) is attached to a plate (5) which is attached directly to the rear surface of the main housing (1) and is provided with tubular stubs (8 and 9) for the coupling of the discharge tube (10), which is connected to the orifice (11) and of the suction tube (12). The said plate (5) may also be attached by pipelines (21 and 22) to another smaller plate (18) which is then attached to the main housing (1), and which is also provided with tubular stubs (19 and 20).