Wide View Flow Sight, -, 1/2 In.-14 NPT, Hex Dia. Flats (In.) -, Max. Working Pressure (PSI) 130 @ 212, Max. Operating Temp. 212 Degrees F, Sight Length (In.) -, Sight Dia. (In.) 1 3/4 in, Overall Length 4 1/4 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