Doc. No. 157 Issue 1.0 Draft Apollo Operations Manual20 March 2019 Page 18 of 27Figure 3 Filling a Keyed Filler Vaporiser5.3.4 Keyed Filler (draining procedure)Caution: Do not allow the drainage container to becomecompletely full during draining.Caution: The vaporiser must only be drained using the correctagent specific adaptor, the adaptor will not fit the filler socket if incorrectadaptor is used.1. Fit the bottle adaptor to an empty bottle. Insert the bottle adaptorwith its two holes facing upwards into the drain socket. Tighten thebottom retaining screw.2. Ensure that the dial is in the “OPEN” position. Ensure that the bottleis below the level of the drain socket and the tube is not kinked. Fordraining purposes (and to allow air to vent) unscrew the topretaining screw slowly as the vaporiser may be pressurised andremove the dummy filler plug from the filler socket.