U-1937A: Poland
2 7/8" X 4 1/2" (73mm X 114mm)
No markings
Picture courtesy Bob Berry |
2 7/8" X 4 3/8" (73mm X 110mm)
No markings (view without cap)
Picture courtesy Bob Berry |
2" X 1 3/9" (51mm X 35mm)
No markings (cap)
Picture courtesy Bob Berry |
This is a dryspot insulator where the top unscrews to expose openings inside the skirt and wire groove to allow a telephone drop wire to pass through the insulator to provide a "dry spot" from rain and decrease leakage loss.
U number assignment by Bob Berry July 2020.
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