Sight Plug Gage, NPT 1-11 1/2 Inch Price For: Each Sight Material: Glass Item: Fused Sight Material: Glass Body: Steel Type: High PSI Fused Liquid Level Function: Allow Visual Inspection of Fluid Levels in Gear Boxes or Reservoirs Sight Dia. (In.): 15/16 NPT: 1- 11-1/2 Max. Operating PSI: 1250 Hex Dia. Flats (In.): 1-3/8 Country of Origin (subject to change): United States