Double Window Flow Sight - 1 In.-11-1/2 NPT Hex Dia Flats (In.) - Max Working Pressure (PSI) 160 @ 150 Max Operating Temp 180 Degrees F Sight Length (In.) - Sight Dia (In.) 1 3/8 in Overall Length 4 5/8 in Nylon Ball Indicator Aids in Viewing Under Low Light Level or Dark Liquid Conditions Vertical or Horizontal Fluid Lines Features Brass Body Buna N Seals Female x Female NPT Tempered Borosilicate Sight Window