Square Polycarbonate Reservoirs use gravity to dispense liquid.  They are designed to serve as a central reservoir of an oiling system. 

This unique square polycarbonate reservoir features an easy-open polypropylene cap.  The unit is vented.  It is suitable for temperatures up to 225°.  Viton seals are used.  There is a 1/8” female NPT outlet with a 5/8”-18 threaded shank for remote mounting.  The reservoir can also be mounted using the (2) 13/64” diameter mounting holes on the built-in polycarbonate bracket. The 1 quart reservoir has 4 3/8” sides and a total height of 6 13/16”.