Flow Sight with Nylon Ball, Inline Double Window, 3/4 In.-14 NPT, Hex Dia. Flats (In.) 1 3/8 in, Max. Working Pressure (PSI) 345 psi, Max. Operating Temp. 180 Degrees F, Sight Length (In.) 1 3/8 in, Sight Dia. (In.) -, Overall Length 5 1/4 in, Aid in Viewing of Dark Fluids in Dim Light Conditions, Condition or Clarity, Vertical or Horizontal Fluid Lines to Observe Fluid Flow, Features Buna N Seals and Borosilicate Sight Window, Female x Female NPT, Solid Brass Bar Stock Construction