These adaptors work for both the S-34 and V-34 gearcase leakage testers. All adaptors have a standard 3/8-16 female thread.
Don't forget that some Mercs & Evinrudes have Yamaha or Suzuki fittings!
Leakage Tester Adaptors
Part No. Description 334Y 8mm for the metrics (Honda, Yamaha) 334Z 10mm (Suzuki) 34SA OMC sterndrive upper gearcase housing 34A 1/4-20 for some small Johnson-Evinrudes