The N100 Series straight pattern needle valves with sight are ideally suited for vertical inline installation requiring controlled visible fluid metering. Knurled wheel provides for smooth, accurate adjustments of flow rate. Drip feed rate is adjustable from full orifice flow to complete shut-off. Flow is readily visible through large sight window. Pressure units supplied with non-vented sights. Gravity feed valves are furnished with a vented sight chamber, provided by a split in the gasket above the sight glass. Standard Features: 1/8, 1/4, 3/8 or 1/2 inch NPTF connection Available in either male or female connections Pressure Rating: Maximum working pressure up to 125 PSI (862 kPa) to orifice