... sight glasses / sanitary flow indicators The sight glass/flow indicator is the most convenient way to visually monito Hygienic sight ... : 304, 316L, Seal(Gasket): EPDM, SILICON, VITON, PTFE , Size range: 1/2",3/4",1", 1.5", 2", 2.5 ... , BSP, parallel or taper),flange(ANSI 150lbs, 300lbs, PN16), Wide-range application: Chemical Processing , Water & Wastewater , Landfills, Irrigation, dairy, beverage, ...