1/4" Stainless Steel (316) Needle Valve - Packed Bonnet FxF NPT, 10,000 PSI * Bubble tight metal to metal seat for positive shut off. * 2 piece non-rotating hardened (17-4PH) tip for first time seal and long service life. * Pressure responsive multi-ring / piston packing for compression and pressure dynamic sealing. * Metal to metal body bonnet seal for high pressure and high temperature sealing. * Unique bonnet locking cam. No accidental removal of head unit, or loosening due to vibration.