Yamato Scientific WG221S Water Purifiers - Manual (Page 12)

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Safety Precautions
Installation and Preparation for Use
Warning
Connection to the unit
(1) Remove the rubber cap from the plug ⑧.
(2) Slide the sleeve to the direction the arrow
shows, and insert securely the socket ⑨
into the plug ⑧.
Make sure the sleeve returns to the original
position when you loose your hold. Then,
you can finish the connection.
The socket has a built-in valve which would
not open for water run until the plug is
connected.
Connect the water-supply hose to a tap with drainage system.
●Connect the hose to a tap with drainage
system. If you connect the water-supply
hose to a tap without drainage system,
damage on the hose could result in overflow
of water.