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The Opto-Matic closed system oiler is designed for all types of equipment where a constant level in an oil sump must be maintained. The closed system design prevents contamination and spillage. The adjustable collar allows the oil level to be externally adjusted to the desired level. A 1/8" NPT port is provided for a vent line back to the housing to allow pressure balancing between the oiler and the housing. Connection: 1/4" NPT. 2-11/16" Diameter. 7-1/16" Minimum height, 7-13/16" maximum height. 250 degree F continuous maximum operating temperature. One-piece glass bottle reservoir. Upper casting, lower body and adjusting collar: zinc. Viton O-ring.