A gas transfer device allowing pure Oxygen from commercial tanks with CGA 540 connections to be transferred into conventional yoke-mode, oxy-clean scuba tanks through a 4 foot teflon core hose. This deluxe version includes a 4,000 psi oxygen gauge installed in the bleeder block to monitor transfill pressures. Includes a metered orifice to prevent rapid transfilling, which can be dangerous. This device is NOT intended for gas mixing purposes; it has only limited flow control, no check valve to prevent cross-gassing, and it's gauge is NOT sufficently accurate to routinely achieve correct mixtures. 3,000 psi service. Delivered Oxy-clean.