Suction device with a filter insert in the suction line

A suction device comprising:

• a suction line with a substantially cylindrical sleeve formed of a material for observing through said sleeve;
• an upstream side connecting piece and a downstream side connecting piece holding said cylindrical sleeve in a suction-tight manner;
• a substantially cylindrical filter with a central axially extending hole, said cylindrical filter having two nonpermeable end walls wherein said central axially extending hole exits through one of said end walls, said nonpermeable end walls are aligned in a direction of flow, said end wall with said axially extending hole includes a connection branch via which said filter can be attached to said downstream side connecting piece in a suction-tight manner, whereby ambient air is drawn into said hole through said filter radially from an outside of said filter:
• a suction snorkel positioned on said upstream side connecting piece.

A suction device comprising:

• a suction passage including a suction line;
• a downstream connecting piece positioned in said suction passage said downstream connecting piece including a support wall defining an opening;
• a sleeve connected to an upstream end of said downstream connecting piece;
• an upstream connecting piece connected to an upstream end of said sleeve;
• a substantially cylindrical filter having a downstream end wall with a contact branch connected to said downstream connecting piece, said filter defining a central axially extending filter hole in communication with a cavity defined by said downstream connecting piece, an area radially outside of said filter being in communication with a cavity defined by said upstream connecting piece, said contact branch being fitted into said opening of said support wall.