The N400 Series Needle Valves allow the flow to be accurately controlled from full orifice opening to shut off. Fluid flow is readily visible through a large sight window. Cross pattern can be used singularly or installed in series. 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 inch PTF female or 1/8 inch NPTF male connection for inlet and outlets 1//4 inch tubing outlet also available Pressure Rating: Maximum working pressure 125 PSI (862 kPa) to orifice