1. It is module design and can be used with G series F.R.L. combination by bracket. 2. This valve can be used as manual 3/2 way valve. 3. Visual indication marked EXH/SUP. 4.This valve meets the standard on installation conducted by operator specified by OSHA(Occupational Safety & Health Administration). When the machinery is maintained and serviced, the purge valve (Safe on-off valve) for remaining pressure shall be used to eliminate the remaining pressure when the air source is cut off. Valve must be locked to prevent accidental operation by a third party during maintenance. This prevents accidental system pressurization & cylinder actuation which can result in injuries to the machine operator.