3 3/8" X 5" (86mm X 127mm)
Picture courtesy Bob Berry
This is a dryspot insulator where the top unscrews to expose openings inside the skirt to allow a telephone drop wire to pass through the insulator to provide a "dry spot" from rain and decrease leakage loss. The cap is made of a bakelite like material.
U number assignment by Bob Berry April 2016
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