One-piece S.S. Stellite tipped impregnated valve Impregnated by a special German process to .002" deep with a .0002" surface build-up to improve wear properties and reduce friction Provides resistance to corrosion and wear that is superior to that developed by hard chromium and electrolysis nickel-plating Valve is light and the provides excellent flow characteristics Black Nitroneg stems 2.000"/50.80 mm head diameter, .3090" stem diameter, 23° tulip, 3.615" outside length