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410 monsoon winterizing port blue cap T

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Engine is a 410 monsoon and the T where the blue cap for wintering is cracked and leaking water. Called the dealer and the T is not a part they sell so anyone know where I could get one?  Thanks 

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And either post a photo here or pay very close attention to details on it, including flare angle (if any) and whether the thread is tapered or straight. 

I'm just guessing, but I would expect it to be a common flare plug with a tee handle.  My second guess would be a J.I.C. plug.  This chart should help you see the differences.


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 Figured out how to post a picture, the crack is just above the blue plug. Also I’m assuming the hose clamps are a one time use?


Edited by Jcm11
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Thanks for the help with the correct part number 605904. Inboard online was adding them to their inventory and they were $1.92 a piece. Finally a reasonable fix!!  


Edited by Jcm11
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