These oilers are used for lubricating the machine. This particular one comes with a metal bowl guard.
It features a 1/4" size port and a setting pressure of 0.16 - 1.0 MPa.
The rated flow is 2310 L/min.
There is a seperate mounting bracket available if required. Available here: http://www.window-machinery-search.co.uk/oiler-bracket.html