Custom/Hybrid 96 xp flushing tip?

I have a 96 xp 800 that has r&d head with 43cc domes and a factory wet pipe spec 2. I know the ski when stock has a t fitting that you hook up the hose with an adapter that is on the back of the head. That fitting is missing and I don't know how to flush i. Do I get and install the t fitting back in the stock location or what? I am just confused because of the pip.

Its a new to me ski and I'm just trying to address issues I see as I'm goin through it. And I don't want to mess anything up but I need to flush it as I ride in salt water most of the time.
 
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