Three-way configuration for use in construction of manifolds, adapters, etc. No tip o-ring exposure. Designed with a precision external thread for fine control. Can be used as a bleed up to 1/2 turn. Full open position is at 1-1/2 turns. Primary seal is made with a FKM o-ring on a tapered seat. Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements.