Color Key Clear View Full Flow Manual Dispensers are ideal for continuous operation. Liquid is dispensed when the lubricator is turned on with a toggle shutoff (using the toggle does not affect the metering adjustment). This oiler features an acrylic or Pyrex (glass) reservoir. The lightweight and durable endplates are made from red, blue, green or yellow polypropylene. Maximum fluid visibility is achieved by eliminating the center post common to many reservoirs.