Lubricant container

1. A container for collecting a lubricant, the container comprising a housing having a longitudinal axial extension between a first end connectable to a source of lubricant and a longitudinally opposite second end, a cap attached to the second end, a piston slidably movable inside the housing between the first end and the second end of the housing, wherein the cap is attached to the second end of the housing by a snap connection for blocking an axial translation between the cap and the housing, the cap and the housing having respectively a first flat surface and a second flat surface contacting each other for preventing rotation of the cap around a longitudinal axis of the housing wherein the cap has a polygonal border with a plurality of border walls, wherein the cap comprises a plurality of snap connections and a plurality of first flat surfaces, the polygonal border comprising a first plurality of border walls and a second plurality of border walls, the plurality of snap connections and the plurality of first flat surfaces being respectively provided on the first plurality of border walls and on the second plurality of border walls, and wherein the first plurality of border walls and the second plurality of border walls are interposed between one another, each border walls of the first plurality comprising a snap connection and being interposed between two border walls of the second plurality of border walls.

2. The container according to claim 1 wherein the cap comprises a vent hole, said vent hole comprising a guide for an external tool, the tool being insertable and guidable in the vent hole for pushing the piston from the second end to the first end of the housing.

3. The container according to claim 2 , wherein the vent hole is coaxial with the longitudinal axis of the housing.

4. The container according to claim 1 , wherein the housing comprises a first cylindrical portion where the piston slidably moves and a second conic portion interposed between the first cylindrical portion and the first end, and wherein the container further includes an adapter having a first rigid portion connectable between the first end of the housing and the source of lubricant, and a second deformable portion subject to contact the second conic portion of the housing for providing a sealing between the housing and the adapter.

5. The container according to claim 4 , wherein the second deformable portion of the adapter is cylindrical in shape and is deformable between a first configuration in which the second deformable portion does not contact the second conic portion of the housing and a second configuration in which the second deformable portion contact the second conic portion of the housing, an opening angle of the second deformable portion being greater in said second configuration than in said first configuration.

6. The container according to claim 4 , wherein the first rigid portion comprises an inner thread for connecting to the first end of the housing and an external thread for connecting to the source of lubricant.

7. The container according to claim 1 , wherein the piston comprises a circumferential surface having a first deformable circumferential lip extending towards the first end of the housing and a second deformable circumferential lip extending towards the second end of the housing, the first and the second circumferential lips being deformable for providing a sealing between the piston and the housing.