Body ABS Inner Silicone Type Duckbill Opening Pressure 2.5~4.5 Kpa Back Pressure = 500 Kpa Common Inner Material Silicone/NBR/VITON/FVMQ/EPDM Common Body Material PP/ABS/PA66/PVDF Common Port Size 1/4'', 1/8'', 1/16'', 3/8'', 3/16'', 5/16'' Experience 5-year History Certificate ISO9001: 2008