NPK PH1 Operator's Manual page 28

AUTO LUBE / UNDERWATER PORT
IDENTIFICATION
NPK PH Series Hammers are equipped with two ports on the main body (A) used in
adapting for AUTO LUBE and underwater use. The air port (17) will allow the
connection of an air line that will allow the hammer to be used underwater. The grease
port (26), located in line with the air port, will allow for AUTO LUBE connection.
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