Sperian part no. 910678, regulator for supplied air respirator (SAR). Mfr lot no. 802632. Hangs on belt; can operate with central air line or portable filtered supply. This item is set up for continuous flow. Each comes with 4-inch tail of 250psi-max hose and coupling. Last flow checks were performed on all between Aug and October 2008. The lab where they were used was decommissioned in 2009 when the work team relocated to a new site.
The American Airworks catalog for 2006/2007 listed this part at $380.00. (See photo.)