A gas transfer device allowing pure Oxygen from commercial tanks with CGA 540 connections to be transferred into conventional Scuba DIN, oxy-clean scuba tanks through a 4 foot teflon core hose. Includes a metered orifice to prevent rapid transfilling, which can be dangerous. Global transfillers are not intended, and should not be used for any type of partial pressure blending. 3,000 psi service. Delivered Oxy-clean.