(DG) Triducer installation

[stanb]

Hi,
I ordered the DST800V through amazon.ca (supplied by amazon not a 3rd party) as part of the i70 system kit.
The instructions talk about a yellow o-ring but the one on the transducer was black and the one in the replacement kit for non-valve thru-hulls was also black (and thinner).

I tried phone support but had no luck reaching anyone who could help - I was told by the one person I got hold of not to worry about it just use it as is.

Regards,
Stan