Viewport Glass Lens and Baffle 1/2 in NPT Hex Dia Flats (in) 7/8 in Max Working Pressure (PSI) 50 psi Max Operating Temp 300 Degrees F Sight Length (in) 1/2 in Sight Dia (in) 1/2 in Overall Length 1 3/32 in Gearboxes Pumps Features Brass Construction