Double security seal| Stern Tube lubrication|Constant air flow type stern Lubrication| Working|

[@tusharpawar2182]

Sir I want to thank you very much because of your KZbin channel videos I cleared my class 2 MOTOR and MEP written and oral exams.

[@hardiktandel7050]

Then what is backup seal ? Same ?

[@piotrrtoip2948]

Nice presentation Greetings from Poland 👍