Chain lubricators dispense liquid by gravity through an adjustable needle valve. The liquid feed rate is visible through a sight chamber. Flow to the brush is controlled with either a manual toggle switch or electronically with a solenoid. Brush bristles can be specified as nylon or stainless steel, and come in round, flat, or roto style. Reservoirs are available in polycarbonate, acrylic, and Pyrex in a number sizes from 1 ounce to 1 gallon.