Need 1/2 US gallon, or one liter, square polyethlene reservior with screw cap. Must be of heavy construction. Would prefer mounting tabs similar to those in the link above, but this is not stricly necessary.

Plastic color is not important, but must be trasparent enough to visually see the fluid level. Plastic cannot be fully opaque.

Order is for manufacture. May need as many as 500 units.