Compact design inline flow sights may be used in either horizontal or vertical pipe runs to indicate flow. May also be used to check clarity of fluid. Machined from solid brass bar stock with large sight windows. Standard Features: 1/4, 3/8, 1 or 1 1/4 inch PTF connection Temperature & Pressure Ratings: Maximum working temperature up to 200°F (93°C) Maximum working pressure up to 50 PSI (345 kPa) at 70°F (21°C) No corrosion Caution: Scratched glass significantly reduces pressure rating.