Hokuetsu AIRMAN PDS185S-6EZ1 Instruction Manual page 15

2.3.1 Service valve
Bore of service valve：20A(R3/4B)×2
Cautions of hose attachment and removal
TR0088
TR0303
Operation with discharge port (compressed air supply port) opened is prohibited
D003
2. Installation
[Taper male screw]

Piping or the hose from this machine service valve should use what can
be borne enough for the safety valve set pressure of this machine.

Please connect piping or a hose to this machine service valve firmly
before operation and during operation.
If the connection is loose, there is a possibility of piping or a hose
separating and getting seriously injured.

Please remove after closing the service valve and relieving remaining
pressure. If pressure remains, there is a possibility of the hose whipping,
causing damage and possibly injury.

In order to use it safely, please read the handling of the work tools often
used.

Do not operate the machine with service valves and relief valve open
unless air hoses and/or pipes are connected. High-pressurized air blows
out and its air pressure could cause injury to the people nearby.

When the machine has to be unavoidably temporarily operated with its
port open, be sure to mount a silencer to reduce noise and wear protective
materials such as earplugs to prevent damage to hearing.
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A220064