2004-2005 Kawasaki STX-15F Jet Ski Factory Service Manual., Page 149Get this manual
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ENGINE LUBRICATION SYSTEM 4-11 Oil Cooler
Oi ler nsta lla ti on
ep Rewlac-einheO-ring [A] with new one and apply grease to Or Fit the O-ring on the oil cooler [B] securely