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Long nose billet aluminum drive coupler for the Kawasaki JS440 and JS550 Jet Ski. This is also for just the engine side coupler on the 550SX reed engines. This is the longer nose version with the 18-1.5mm threads. The nose of the coupler sticks out 1.095" and the overall length of the coupler is 2.245". Replaces Kawasaki OEM part# 42034-3706.

Note: For the shorter 550SX driveshaft coupler, use our 18mm Kaw 750 coupler part # 31-700199.